diff --git a/app/Http/Controllers/System/HolidayController.php b/app/Http/Controllers/System/HolidayController.php
index 812b424a..2d88475d 100644
--- a/app/Http/Controllers/System/HolidayController.php
+++ b/app/Http/Controllers/System/HolidayController.php
@@ -61,6 +61,20 @@ public function store(Request $request): JsonResponse
 
         $tenantId = session('selected_tenant_id', 1);
 
+        // 중복 체크: 같은 날짜 + 같은 이름
+        $exists = Holiday::forTenant($tenantId)
+            ->where('start_date', $request->input('startDate'))
+            ->where('end_date', $request->input('endDate'))
+            ->where('name', $request->input('name'))
+            ->exists();
+
+        if ($exists) {
+            return response()->json([
+                'success' => false,
+                'message' => '동일한 휴일이 이미 등록되어 있습니다.',
+            ], 422);
+        }
+
         $holiday = Holiday::create([
             'tenant_id' => $tenantId,
             'start_date' => $request->input('startDate'),
@@ -132,8 +146,21 @@ public function bulkStore(Request $request): JsonResponse
 
         $tenantId = session('selected_tenant_id', 1);
         $count = 0;
+        $skipped = 0;
 
         foreach ($request->input('holidays') as $item) {
+            // 중복 체크
+            $exists = Holiday::forTenant($tenantId)
+                ->where('start_date', $item['startDate'])
+                ->where('end_date', $item['endDate'])
+                ->where('name', $item['name'])
+                ->exists();
+
+            if ($exists) {
+                $skipped++;
+                continue;
+            }
+
             Holiday::create([
                 'tenant_id' => $tenantId,
                 'start_date' => $item['startDate'],
@@ -146,9 +173,37 @@ public function bulkStore(Request $request): JsonResponse
             $count++;
         }
 
+        $message = "{$count}건의 휴일이 등록되었습니다.";
+        if ($skipped > 0) {
+            $message .= " (중복 {$skipped}건 제외)";
+        }
+
         return response()->json([
             'success' => true,
-            'message' => "{$count}건의 휴일이 등록되었습니다.",
+            'message' => $message,
+        ]);
+    }
+
+    /**
+     * 해당 연도의 모든 휴일 삭제
+     */
+    public function destroyByYear(Request $request): JsonResponse
+    {
+        $request->validate([
+            'year' => 'required|integer|min:2000|max:2100',
+        ]);
+
+        $tenantId = session('selected_tenant_id', 1);
+        $year = $request->input('year');
+
+        $count = Holiday::forTenant($tenantId)
+            ->forYear($year)
+            ->delete();
+
+        return response()->json([
+            'success' => true,
+            'message' => "{$year}년도 휴일 {$count}건이 삭제되었습니다.",
+            'data' => ['deleted' => $count],
         ]);
     }
 }
diff --git a/resources/views/system/holidays/index.blade.php b/resources/views/system/holidays/index.blade.php
index 8d7f80dd..d04f07bc 100644
--- a/resources/views/system/holidays/index.blade.php
+++ b/resources/views/system/holidays/index.blade.php
@@ -180,6 +180,26 @@ function HolidayManagement() {
         }
     };
 
+    const handleDeleteYear = async () => {
+        if (!confirm(`${selectedYear}년도의 모든 휴일(${totalHolidays}건)을 삭제하시겠습니까?\n\n이 작업은 되돌릴 수 없습니다.`)) return;
+        try {
+            const res = await fetch(`/system/holidays/year/${selectedYear}`, {
+                method: 'DELETE',
+                headers: { 'X-CSRF-TOKEN': csrfToken },
+            });
+            const data = await res.json();
+            if (res.ok) {
+                alert(data.message);
+                fetchHolidays(selectedYear);
+            } else {
+                alert(data.message || '삭제에 실패했습니다.');
+            }
+        } catch (err) {
+            console.error('연도별 삭제 실패:', err);
+            alert('삭제에 실패했습니다.');
+        }
+    };
+
     // 대량 등록 파싱
     const parseBulkText = (text) => {
         const lines = text.trim().split('\n').filter(l => l.trim());
@@ -420,6 +440,14 @@ className={`relative h-9 flex flex-col items-center justify-center rounded curso
                                 </div>
                             );
                         })}
+                        {totalHolidays > 0 && (
+                            <button
+                                onClick={handleDeleteYear}
+                                className="ml-auto px-3 py-1.5 text-sm text-red-600 hover:text-white hover:bg-red-600 border border-red-300 rounded-lg transition-colors"
+                            >
+                                {selectedYear}년 전체 삭제
+                            </button>
+                        )}
                     </div>
                 </div>
             </div>
diff --git a/routes/web.php b/routes/web.php
index 166a74a5..051504ca 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -401,6 +401,7 @@
         Route::put('/{id}', [HolidayController::class, 'update'])->name('update');
         Route::delete('/{id}', [HolidayController::class, 'destroy'])->name('destroy');
         Route::post('/bulk', [HolidayController::class, 'bulkStore'])->name('bulk');
+        Route::delete('/year/{year}', [HolidayController::class, 'destroyByYear'])->name('destroy-year');
     });
 
     // 명함 OCR API