diff --git a/myApp/HaruDanim/IOS/ContentView.swift b/myApp/HaruDanim/IOS/ContentView.swift
index 8101d43..2fecf95 100644
--- a/myApp/HaruDanim/IOS/ContentView.swift
+++ b/myApp/HaruDanim/IOS/ContentView.swift
@@ -10,7 +10,7 @@ import SwiftData
 
 struct ContentView: View {
     @Environment(\.modelContext) private var context
-    @AppStorage(SettingsKeys.theme) private var theme: String = "light"
+    @AppStorage(SettingsKeys.theme, store: AppGroup.defaults) private var theme: String = "light"
     @State private var showSplash = true
 
     var body: some View {
diff --git a/myApp/HaruDanim/IOS/Views/SettingsView.swift b/myApp/HaruDanim/IOS/Views/SettingsView.swift
index 5d3a229..e399b5e 100644
--- a/myApp/HaruDanim/IOS/Views/SettingsView.swift
+++ b/myApp/HaruDanim/IOS/Views/SettingsView.swift
@@ -10,7 +10,8 @@ import SwiftData
 
 struct SettingsView: View {
     @Query(sort: [SortDescriptor(\Goal.sortOrder), SortDescriptor(\Goal.createdAt)]) private var goals: [Goal]
-    @AppStorage(SettingsKeys.theme) private var theme = "light"
+    // 테마는 위젯('앱 테마와 일치' 옵션)이 읽어야 하므로 App Group defaults에 저장
+    @AppStorage(SettingsKeys.theme, store: AppGroup.defaults) private var theme = "light"
     @AppStorage(SettingsKeys.language) private var language = AppLanguage.ko.rawValue
     // 집계 기준 설정은 위젯·워치와 공유해야 하므로 App Group defaults에 저장
     @AppStorage(SettingsKeys.weekStartWeekday, store: AppGroup.defaults) private var weekStartWeekday = 2
diff --git a/myApp/HaruDanim/IOS/Views/WidgetPreviewScreen.swift b/myApp/HaruDanim/IOS/Views/WidgetPreviewScreen.swift
index 7c0b258..e398d51 100644
--- a/myApp/HaruDanim/IOS/Views/WidgetPreviewScreen.swift
+++ b/myApp/HaruDanim/IOS/Views/WidgetPreviewScreen.swift
@@ -14,6 +14,10 @@ import WidgetKit
 struct WidgetPreviewScreen: View {
     let showLock: Bool
 
+    /// -widgetTheme light|dark|glass (§8.1 검증용)
+    private let theme = UserDefaults.standard.string(forKey: "widgetTheme")
+        .flatMap(WidgetThemeOption.init(rawValue:)) ?? .matchApp
+
     @State private var actionEntry: ActionRunEntry?
     @State private var goalBarsEntry: GoalBarsEntry?
     @State private var questRingEntry: QuestRingEntry?
@@ -34,7 +38,18 @@ struct WidgetPreviewScreen: View {
                 }
                 .padding()
             }
-            .background(Color(white: 0.9))
+            .background {
+                if theme == .glass {
+                    // 리퀴드 글라스 확인용: 유리 질감이 드러나도록 화려한 배경 위에 렌더링
+                    LinearGradient(
+                        colors: [.blue, .purple, .orange, .pink],
+                        startPoint: .topLeading, endPoint: .bottomTrailing
+                    )
+                    .ignoresSafeArea()
+                } else {
+                    Color(white: 0.9).ignoresSafeArea()
+                }
+            }
             .onAppear {
                 load()
                 // -widgetPreviewScroll B|C|D|S → 해당 섹션으로 자동 스크롤
@@ -63,12 +78,23 @@ struct WidgetPreviewScreen: View {
                 ("dots", LockGoalProvider.makeEntry(dots)),
             ]
         } else {
-            actionEntry = ActionRunProvider.makeEntry(ActionRunConfigIntent())
-            goalBarsEntry = GoalBarsProvider.makeEntry(GoalBarsConfigIntent())
-            questRingEntry = QuestRingProvider.makeEntry(QuestRingConfigIntent())
-            gridEntry = GoalQuestGridProvider.makeEntry(GoalQuestGridConfigIntent())
-            statsEntrySmall = StatsChartProvider.makeEntry(StatsChartConfigIntent(), family: .systemSmall)
-            statsEntryMedium = StatsChartProvider.makeEntry(StatsChartConfigIntent(), family: .systemMedium)
+            // 모든 위젯 설정에 테마 주입 (§8.1 검증)
+            let actionConfig = ActionRunConfigIntent()
+            actionConfig.theme = theme
+            actionEntry = ActionRunProvider.makeEntry(actionConfig)
+            let goalConfig = GoalBarsConfigIntent()
+            goalConfig.theme = theme
+            goalBarsEntry = GoalBarsProvider.makeEntry(goalConfig)
+            let questConfig = QuestRingConfigIntent()
+            questConfig.theme = theme
+            questRingEntry = QuestRingProvider.makeEntry(questConfig)
+            let gridConfig = GoalQuestGridConfigIntent()
+            gridConfig.theme = theme
+            gridEntry = GoalQuestGridProvider.makeEntry(gridConfig)
+            let statsConfig = StatsChartConfigIntent()
+            statsConfig.theme = theme
+            statsEntrySmall = StatsChartProvider.makeEntry(statsConfig, family: .systemSmall)
+            statsEntryMedium = StatsChartProvider.makeEntry(statsConfig, family: .systemMedium)
         }
     }
 
@@ -171,10 +197,19 @@ struct WidgetPreviewScreen: View {
         case .systemLarge: CGSize(width: 338, height: 354)
         default: CGSize(width: 158, height: 158)
         }
+        // containerBackground는 실제 위젯 컨텍스트 밖에서는 무시되므로
+        // 미리보기 박스가 테마 배경/컬러 스킴을 직접 재현한다
         return content()
             .padding(12)
             .frame(width: size.width, height: size.height)
-            .background(AppTheme.background)
+            .background {
+                if theme == .glass {
+                    Rectangle().fill(.ultraThinMaterial)
+                } else {
+                    AppTheme.background
+                }
+            }
+            .environment(\.colorScheme, theme.forcedScheme ?? .light)
             .clipShape(RoundedRectangle(cornerRadius: 22, style: .continuous))
             .shadow(color: .black.opacity(0.08), radius: 6, y: 2)
     }
diff --git a/myApp/HaruDanim/Shared/DataStore.swift b/myApp/HaruDanim/Shared/DataStore.swift
index cfc8eec..ca39811 100644
--- a/myApp/HaruDanim/Shared/DataStore.swift
+++ b/myApp/HaruDanim/Shared/DataStore.swift
@@ -133,7 +133,8 @@ nonisolated enum SettingsMigration {
         guard !group.bool(forKey: doneKey) else { return }
         let standard = UserDefaults.standard
         for key in [SettingsKeys.weekStartWeekday, SettingsKeys.dayStartMinutes,
-                    SettingsKeys.liveActivityMode, SettingsKeys.minSessionSeconds] {
+                    SettingsKeys.liveActivityMode, SettingsKeys.minSessionSeconds,
+                    SettingsKeys.theme] {
             if group.object(forKey: key) == nil, let value = standard.object(forKey: key) {
                 group.set(value, forKey: key)
             }
diff --git a/myApp/HaruDanim/Widgets/ActionRunWidget.swift b/myApp/HaruDanim/Widgets/ActionRunWidget.swift
index f1d5f08..5170708 100644
--- a/myApp/HaruDanim/Widgets/ActionRunWidget.swift
+++ b/myApp/HaruDanim/Widgets/ActionRunWidget.swift
@@ -19,6 +19,9 @@ struct ActionRunConfigIntent: WidgetConfigurationIntent {
     @Parameter(title: "표시 기간", default: .day)
     var period: SpanOption
 
+    @Parameter(title: "위젯 테마", default: .matchApp)
+    var theme: WidgetThemeOption
+
     @Parameter(title: "행동 1")
     var action1: ActionEntity?
 
@@ -37,6 +40,7 @@ struct ActionRunConfigIntent: WidgetConfigurationIntent {
 struct ActionRunEntry: TimelineEntry {
     let date: Date
     let locked: Bool
+    let theme: WidgetThemeOption
     let periodLabel: String
     let cells: [ActionCellSnapshot]
 }
@@ -45,7 +49,7 @@ struct ActionRunProvider: AppIntentTimelineProvider {
     @MainActor
     static func makeEntry(_ configuration: ActionRunConfigIntent) -> ActionRunEntry {
         guard WidgetStore.isUnlocked else {
-            return ActionRunEntry(date: .now, locked: true, periodLabel: "", cells: [])
+            return ActionRunEntry(date: .now, locked: true, theme: configuration.theme, periodLabel: "", cells: [])
         }
         let span = configuration.period.statSpan
         let chosen = [configuration.action1, configuration.action2, configuration.action3, configuration.action4]
@@ -55,13 +59,14 @@ struct ActionRunProvider: AppIntentTimelineProvider {
         return ActionRunEntry(
             date: .now,
             locked: false,
+            theme: configuration.theme,
             periodLabel: configuration.period.label,
             cells: actions.map { ActionCellSnapshot.make(action: $0, span: span) }
         )
     }
 
     func placeholder(in context: Context) -> ActionRunEntry {
-        ActionRunEntry(date: .now, locked: false, periodLabel: "오늘", cells: [])
+        ActionRunEntry(date: .now, locked: false, theme: .matchApp, periodLabel: "오늘", cells: [])
     }
 
     @MainActor
@@ -180,7 +185,7 @@ struct ActionRunWidgetView: View {
                 }
             }
         }
-        .containerBackground(AppTheme.background, for: .widget)
+        .widgetTheme(entry.theme)
     }
 }
 
diff --git a/myApp/HaruDanim/Widgets/GoalWidgets.swift b/myApp/HaruDanim/Widgets/GoalWidgets.swift
index c336ee4..74945d5 100644
--- a/myApp/HaruDanim/Widgets/GoalWidgets.swift
+++ b/myApp/HaruDanim/Widgets/GoalWidgets.swift
@@ -26,11 +26,15 @@ struct GoalBarsConfigIntent: WidgetConfigurationIntent {
 
     @Parameter(title: "목표 4")
     var goal4: GoalEntity?
+
+    @Parameter(title: "위젯 테마", default: .matchApp)
+    var theme: WidgetThemeOption
 }
 
 struct GoalBarsEntry: TimelineEntry {
     let date: Date
     let locked: Bool
+    let theme: WidgetThemeOption
     let goals: [GoalSnapshot]
 }
 
@@ -38,17 +42,17 @@ struct GoalBarsProvider: AppIntentTimelineProvider {
     @MainActor
     static func makeEntry(_ configuration: GoalBarsConfigIntent) -> GoalBarsEntry {
         guard WidgetStore.isUnlocked else {
-            return GoalBarsEntry(date: .now, locked: true, goals: [])
+            return GoalBarsEntry(date: .now, locked: true, theme: configuration.theme, goals: [])
         }
         let chosen = [configuration.goal1, configuration.goal2, configuration.goal3, configuration.goal4]
             .compactMap { $0 }
             .compactMap { WidgetStore.goal($0.id) }
         let goals = chosen.isEmpty ? WidgetStore.defaultGoals(4) : chosen
-        return GoalBarsEntry(date: .now, locked: false, goals: goals.map { GoalSnapshot.make(goal: $0) })
+        return GoalBarsEntry(date: .now, locked: false, theme: configuration.theme, goals: goals.map { GoalSnapshot.make(goal: $0) })
     }
 
     func placeholder(in context: Context) -> GoalBarsEntry {
-        GoalBarsEntry(date: .now, locked: false, goals: [])
+        GoalBarsEntry(date: .now, locked: false, theme: .matchApp, goals: [])
     }
 
     @MainActor
@@ -81,10 +85,7 @@ struct GoalBarsCellView: View {
         }
         .padding(10)
         .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
-        .background(
-            RoundedRectangle(cornerRadius: 14, style: .continuous)
-                .fill(AppTheme.surface)
-        )
+        .background(WidgetCellBackground())
     }
 }
 
@@ -137,7 +138,7 @@ struct GoalBarsWidgetView: View {
                 }
             }
         }
-        .containerBackground(AppTheme.background, for: .widget)
+        .widgetTheme(entry.theme)
     }
 }
 
@@ -170,11 +171,15 @@ struct GoalQuestGridConfigIntent: WidgetConfigurationIntent {
 
     @Parameter(title: "진행률 기간", default: .day)
     var span: SpanOption
+
+    @Parameter(title: "위젯 테마", default: .matchApp)
+    var theme: WidgetThemeOption
 }
 
 struct GoalQuestGridEntry: TimelineEntry {
     let date: Date
     let locked: Bool
+    let theme: WidgetThemeOption
     let spanLabel: String
     let goals: [GoalSnapshot]
 }
@@ -183,7 +188,7 @@ struct GoalQuestGridProvider: AppIntentTimelineProvider {
     @MainActor
     static func makeEntry(_ configuration: GoalQuestGridConfigIntent) -> GoalQuestGridEntry {
         guard WidgetStore.isUnlocked else {
-            return GoalQuestGridEntry(date: .now, locked: true, spanLabel: "", goals: [])
+            return GoalQuestGridEntry(date: .now, locked: true, theme: configuration.theme, spanLabel: "", goals: [])
         }
         let span = configuration.span.statSpan
         var goals: [Goal] = []
@@ -193,13 +198,14 @@ struct GoalQuestGridProvider: AppIntentTimelineProvider {
         return GoalQuestGridEntry(
             date: .now,
             locked: false,
+            theme: configuration.theme,
             spanLabel: configuration.span.label,
             goals: goals.map { GoalSnapshot.make(goal: $0, span: span) }
         )
     }
 
     func placeholder(in context: Context) -> GoalQuestGridEntry {
-        GoalQuestGridEntry(date: .now, locked: false, spanLabel: "오늘", goals: [])
+        GoalQuestGridEntry(date: .now, locked: false, theme: .matchApp, spanLabel: "오늘", goals: [])
     }
 
     @MainActor
@@ -271,7 +277,7 @@ struct GoalQuestGridWidgetView: View {
                 }
             }
         }
-        .containerBackground(AppTheme.background, for: .widget)
+        .widgetTheme(entry.theme)
     }
 
     private func goalSection(_ goal: GoalSnapshot, maxCount: Int, columns: Int, ringSize: CGFloat) -> some View {
diff --git a/myApp/HaruDanim/Widgets/QuestRingWidget.swift b/myApp/HaruDanim/Widgets/QuestRingWidget.swift
index 0e30382..a088198 100644
--- a/myApp/HaruDanim/Widgets/QuestRingWidget.swift
+++ b/myApp/HaruDanim/Widgets/QuestRingWidget.swift
@@ -19,6 +19,9 @@ struct QuestRingConfigIntent: WidgetConfigurationIntent {
     @Parameter(title: "진행률 기간", default: .day)
     var span: SpanOption
 
+    @Parameter(title: "위젯 테마", default: .matchApp)
+    var theme: WidgetThemeOption
+
     @Parameter(title: "다짐 1")
     var quest1: QuestEntity?
 
@@ -37,6 +40,7 @@ struct QuestRingConfigIntent: WidgetConfigurationIntent {
 struct QuestRingEntry: TimelineEntry {
     let date: Date
     let locked: Bool
+    let theme: WidgetThemeOption
     let spanLabel: String
     let cells: [QuestCellSnapshot]
 }
@@ -45,7 +49,7 @@ struct QuestRingProvider: AppIntentTimelineProvider {
     @MainActor
     static func makeEntry(_ configuration: QuestRingConfigIntent) -> QuestRingEntry {
         guard WidgetStore.isUnlocked else {
-            return QuestRingEntry(date: .now, locked: true, spanLabel: "", cells: [])
+            return QuestRingEntry(date: .now, locked: true, theme: configuration.theme, spanLabel: "", cells: [])
         }
         let span = configuration.span.statSpan
         var quests = [configuration.quest1, configuration.quest2, configuration.quest3, configuration.quest4]
@@ -57,13 +61,14 @@ struct QuestRingProvider: AppIntentTimelineProvider {
         return QuestRingEntry(
             date: .now,
             locked: false,
+            theme: configuration.theme,
             spanLabel: configuration.span.label,
             cells: quests.map { QuestCellSnapshot.make(quest: $0, span: span) }
         )
     }
 
     func placeholder(in context: Context) -> QuestRingEntry {
-        QuestRingEntry(date: .now, locked: false, spanLabel: "오늘", cells: [])
+        QuestRingEntry(date: .now, locked: false, theme: .matchApp, spanLabel: "오늘", cells: [])
     }
 
     @MainActor
@@ -116,10 +121,7 @@ struct QuestRingActionCellView: View {
         }
         .frame(maxWidth: .infinity, maxHeight: .infinity)
         .padding(6)
-        .background(
-            RoundedRectangle(cornerRadius: 14, style: .continuous)
-                .fill(AppTheme.surface)
-        )
+        .background(WidgetCellBackground())
     }
 
     private var percentText: String {
@@ -183,7 +185,7 @@ struct QuestRingWidgetView: View {
                 }
             }
         }
-        .containerBackground(AppTheme.background, for: .widget)
+        .widgetTheme(entry.theme)
     }
 }
 
diff --git a/myApp/HaruDanim/Widgets/StatsChartWidget.swift b/myApp/HaruDanim/Widgets/StatsChartWidget.swift
index 60c47b2..336f350 100644
--- a/myApp/HaruDanim/Widgets/StatsChartWidget.swift
+++ b/myApp/HaruDanim/Widgets/StatsChartWidget.swift
@@ -41,6 +41,9 @@ struct StatsChartConfigIntent: WidgetConfigurationIntent {
     @Parameter(title: "통계 기간", default: .week)
     var span: StatsChartSpan
 
+    @Parameter(title: "위젯 테마", default: .matchApp)
+    var theme: WidgetThemeOption
+
     @Parameter(title: "행동 1")
     var action1: ActionEntity?
 
@@ -66,6 +69,7 @@ struct StatsPoint: Identifiable {
 struct StatsChartEntry: TimelineEntry {
     let date: Date
     let locked: Bool
+    let theme: WidgetThemeOption
     let title: String
     let isWeekAxis: Bool
     let isTimeType: Bool
@@ -78,7 +82,7 @@ struct StatsChartProvider: AppIntentTimelineProvider {
     @MainActor
     static func makeEntry(_ configuration: StatsChartConfigIntent, family: WidgetFamily) -> StatsChartEntry {
         guard WidgetStore.isUnlocked else {
-            return StatsChartEntry(date: .now, locked: true, title: "", isWeekAxis: false,
+            return StatsChartEntry(date: .now, locked: true, theme: configuration.theme, title: "", isWeekAxis: false,
                                    isTimeType: true, names: [], colorHexes: [], points: [])
         }
         // 소형은 "한 달 (하루 단위)" 제외 (CLAUDE.md §8.3) → 주 단위로 대체
@@ -132,6 +136,7 @@ struct StatsChartProvider: AppIntentTimelineProvider {
         return StatsChartEntry(
             date: now,
             locked: false,
+            theme: configuration.theme,
             title: span.title,
             isWeekAxis: span == .monthByWeek,
             isTimeType: isTimeType,
@@ -142,7 +147,7 @@ struct StatsChartProvider: AppIntentTimelineProvider {
     }
 
     func placeholder(in context: Context) -> StatsChartEntry {
-        StatsChartEntry(date: .now, locked: false, title: "일주일 통계", isWeekAxis: false,
+        StatsChartEntry(date: .now, locked: false, theme: .matchApp, title: "일주일 통계", isWeekAxis: false,
                         isTimeType: true, names: [], colorHexes: [], points: [])
     }
 
@@ -185,7 +190,7 @@ struct StatsChartWidgetView: View {
                 }
             }
         }
-        .containerBackground(AppTheme.background, for: .widget)
+        .widgetTheme(entry.theme)
     }
 
     private var colors: [Color] {
diff --git a/myApp/HaruDanim/Widgets/WidgetTheme.swift b/myApp/HaruDanim/Widgets/WidgetTheme.swift
new file mode 100644
index 0000000..f7aed4f
--- /dev/null
+++ b/myApp/HaruDanim/Widgets/WidgetTheme.swift
@@ -0,0 +1,94 @@
+//
+//  WidgetTheme.swift
+//  Haru_DanimWidgets
+//
+//  위젯 테마 옵션 (CLAUDE.md §8.1)
+//  1. 앱 테마와 일치  2. 라이트/다크 고정  3. 리퀴드 글라스(유리 질감 배경)
+//
+
+import AppIntents
+import SwiftUI
+import WidgetKit
+
+enum WidgetThemeOption: String, AppEnum {
+    case matchApp
+    case light
+    case dark
+    case glass
+
+    static let typeDisplayRepresentation = TypeDisplayRepresentation(name: "위젯 테마")
+    static let caseDisplayRepresentations: [WidgetThemeOption: DisplayRepresentation] = [
+        .matchApp: "앱 테마와 일치",
+        .light: "라이트 고정",
+        .dark: "다크 고정",
+        .glass: "리퀴드 글라스",
+    ]
+
+    /// 강제할 컬러 스킴. 리퀴드 글라스는 시스템 모드를 따른다.
+    var forcedScheme: ColorScheme? {
+        switch self {
+        case .light:
+            return .light
+        case .dark:
+            return .dark
+        case .matchApp:
+            let raw = AppGroup.defaults.string(forKey: SettingsKeys.theme)
+                ?? UserDefaults.standard.string(forKey: SettingsKeys.theme) ?? "light"
+            return raw == "dark" ? .dark : .light
+        case .glass:
+            return nil
+        }
+    }
+}
+
+// MARK: - 환경값: 리퀴드 글라스 여부 (셀 표면 스타일 변형용)
+
+private struct WidgetGlassKey: EnvironmentKey {
+    static let defaultValue = false
+}
+
+extension EnvironmentValues {
+    var widgetGlass: Bool {
+        get { self[WidgetGlassKey.self] }
+        set { self[WidgetGlassKey.self] = newValue }
+    }
+}
+
+// MARK: - 테마 적용 모디파이어
+
+struct WidgetThemeModifier: ViewModifier {
+    let theme: WidgetThemeOption
+
+    func body(content: Content) -> some View {
+        switch theme {
+        case .glass:
+            // 유리 질감 배경: 반투명 머티리얼 위에서 잘 보이도록 셀도 머티리얼로 변형
+            content
+                .environment(\.widgetGlass, true)
+                .containerBackground(for: .widget) {
+                    Rectangle().fill(.ultraThinMaterial)
+                }
+        case .light, .dark, .matchApp:
+            content
+                .environment(\.colorScheme, theme.forcedScheme ?? .light)
+                .containerBackground(AppTheme.background, for: .widget)
+        }
+    }
+}
+
+extension View {
+    /// 위젯 루트에 테마 옵션 적용 (컬러 스킴 강제 + 배경)
+    func widgetTheme(_ theme: WidgetThemeOption) -> some View {
+        modifier(WidgetThemeModifier(theme: theme))
+    }
+}
+
+/// 셀 카드 배경: 일반 테마는 표면색, 리퀴드 글라스는 머티리얼
+struct WidgetCellBackground: View {
+    @Environment(\.widgetGlass) private var glass
+
+    var body: some View {
+        RoundedRectangle(cornerRadius: 14, style: .continuous)
+            .fill(glass ? AnyShapeStyle(.thinMaterial) : AnyShapeStyle(AppTheme.surface))
+    }
+}