diff --git a/frontend/src/components/BacktestHistoryPage.tsx b/frontend/src/components/BacktestHistoryPage.tsx
index 5f13bf6..a91444f 100644
--- a/frontend/src/components/BacktestHistoryPage.tsx
+++ b/frontend/src/components/BacktestHistoryPage.tsx
@@ -50,6 +50,7 @@ import '../styles/strategyEditorTheme.css';
 import { getKoreanName } from '../utils/marketNameCache';
 import { repairUtf8Mojibake } from '../utils/textEncoding';
 import { enrichStrategyNameMap, strategyNamesFromList } from '../utils/strategyNameResolver';
+import { markStrategyIdsMissingUnlessValid } from '../utils/strategyMissingCache';
 
 const LEFT_KEY = 'btd-left-width';
 const RIGHT_KEY = 'btd-right-width';
@@ -148,6 +149,10 @@ export function BacktestHistoryPage({ theme = 'dark' }: Props) {
       loadStrategies(),
     ]);
     const baseNames = strategyNamesFromList(strategies);
+    markStrategyIdsMissingUnlessValid(
+      strategies.map(s => s.id).filter((id): id is number => id != null && id > 0),
+      trades.map(t => t.strategyId),
+    );
     const strategyNames = await enrichStrategyNameMap(
       baseNames,
       trades.map(t => t.strategyId),
@@ -166,6 +171,13 @@ export function BacktestHistoryPage({ theme = 'dark' }: Props) {
       loadStrategies(),
     ]);
     const baseNames = strategyNamesFromList(strategies);
+    markStrategyIdsMissingUnlessValid(
+      strategies.map(s => s.id).filter((id): id is number => id != null && id > 0),
+      [
+        ...trades.map(t => t.strategyId),
+        ...list.map(r => r.strategyId),
+      ],
+    );
     const strategyNames = await enrichStrategyNameMap(
       baseNames,
       [
diff --git a/frontend/src/components/backtest/BacktestAnalysisChart.tsx b/frontend/src/components/backtest/BacktestAnalysisChart.tsx
index f1dd062..ff87fe0 100644
--- a/frontend/src/components/backtest/BacktestAnalysisChart.tsx
+++ b/frontend/src/components/backtest/BacktestAnalysisChart.tsx
@@ -2,6 +2,7 @@ import React, { useCallback, useEffect, useMemo, useRef, useState, type MutableR
 import TradingChart from '../TradingChart';
 import type { BacktestSignal, StrategyDto } from '../../utils/backendApi';
 import { loadStrategyForNotification } from '../../utils/backendApi';
+import { isStrategyMissingOnServer } from '../../utils/strategyMissingCache';
 import type { ChartType, IndicatorConfig, OHLCVBar, Theme, Timeframe } from '../../types';
 import { loadAnalysisCandles } from '../../utils/analysisChartData';
 import type { ChartManager } from '../../utils/ChartManager';
@@ -149,7 +150,7 @@ const BacktestAnalysisChart: React.FC<Props> = ({
   }, [strategy, timeframeRaw]);
 
   useEffect(() => {
-    if (!strategyId) {
+    if (!strategyId || isStrategyMissingOnServer(strategyId)) {
       setStrategy(undefined);
       setStrategyLoading(false);
       return;
diff --git a/frontend/src/utils/backendApi.ts b/frontend/src/utils/backendApi.ts
index 66f80c7..6c209cf 100644
--- a/frontend/src/utils/backendApi.ts
+++ b/frontend/src/utils/backendApi.ts
@@ -1113,9 +1113,9 @@ export async function loadStrategy(id: number): Promise<StrategyDto | null> {
   return request<StrategyDto>(`/strategies/${id}`);
 }
 
-/** 알림·지표 표시 — missing 캐시 무시, 성공 시 캐시 해제 */
+/** 알림·지표 표시 — missing 캐시 적용, 성공 시 캐시 해제 */
 export async function loadStrategyForNotification(id: number): Promise<StrategyDto | null> {
-  if (!hasRegisteredUser() || id <= 0) return null;
+  if (!hasRegisteredUser() || id <= 0 || isStrategyMissingOnServer(id)) return null;
   const dto = await request<StrategyDto>(`/strategies/${id}`);
   if (dto) unmarkStrategyMissingOnServer(id);
   return dto;
diff --git a/frontend/src/utils/strategyMissingCache.ts b/frontend/src/utils/strategyMissingCache.ts
index 6329f8b..f409c92 100644
--- a/frontend/src/utils/strategyMissingCache.ts
+++ b/frontend/src/utils/strategyMissingCache.ts
@@ -65,4 +65,19 @@ export function markStrategyMissingFromPath(pathOnly: string): void {
   if (m) markStrategyMissingOnServer(Number(m[1]));
 }
 
+/** 목록에 없는 참조 ID를 missing 으로 기록 — 삭제된 전략 404 반복 방지 */
+export function markStrategyIdsMissingUnlessValid(
+  validIds: Iterable<number>,
+  referencedIds: Iterable<number | null | undefined>,
+): void {
+  const valid = new Set(
+    [...validIds].map(id => Math.trunc(id)).filter(id => id > 0),
+  );
+  for (const raw of referencedIds) {
+    if (raw == null) continue;
+    const id = Math.trunc(raw);
+    if (id > 0 && !valid.has(id)) markStrategyMissingOnServer(id);
+  }
+}
+
 hydrateStrategyMissingCache();
diff --git a/frontend/src/utils/strategyNameResolver.ts b/frontend/src/utils/strategyNameResolver.ts
index d791b93..4f47354 100644
--- a/frontend/src/utils/strategyNameResolver.ts
+++ b/frontend/src/utils/strategyNameResolver.ts
@@ -2,6 +2,7 @@
  * 전략 ID → 이름 해석 (목록에 없거나 삭제된 전략 포함)
  */
 import { loadStrategyForNotification, type StrategyDto } from './backendApi';
+import { isStrategyMissingOnServer } from './strategyMissingCache';
 
 /** 전략 목록 + 누락 ID별 단건 조회로 이름 맵 보강 */
 export async function enrichStrategyNameMap(
@@ -12,7 +13,7 @@ export async function enrichStrategyNameMap(
   const missing = [...new Set(
     [...ids]
       .map(id => (id != null && id > 0 ? Math.trunc(id) : null))
-      .filter((id): id is number => id != null && !out[id]),
+      .filter((id): id is number => id != null && !out[id] && !isStrategyMissingOnServer(id)),
   )];
   if (!missing.length) return out;