diff --git a/backend/src/query-api/logs/dto/log-search-query.dto.ts b/backend/src/query-api/logs/dto/log-search-query.dto.ts
index 5ac0bee..da0ff90 100644
--- a/backend/src/query-api/logs/dto/log-search-query.dto.ts
+++ b/backend/src/query-api/logs/dto/log-search-query.dto.ts
@@ -1,4 +1,4 @@
-import { Type } from "class-transformer";
+import { Transform, Type } from "class-transformer";
 import {
   IsIn,
   IsInt,
@@ -22,6 +22,9 @@ export class LogSearchQueryDto {
   environment?: string;
 
   @IsOptional()
+  @Transform(({ value }) =>
+    typeof value === "string" ? value.toUpperCase() : value,
+  )
   @IsIn(["DEBUG", "INFO", "WARN", "ERROR"])
   level?: "DEBUG" | "INFO" | "WARN" | "ERROR";
 
diff --git a/backend/src/query-api/logs/logs.controller.ts b/backend/src/query-api/logs/logs.controller.ts
index 464dcaa..b5439db 100644
--- a/backend/src/query-api/logs/logs.controller.ts
+++ b/backend/src/query-api/logs/logs.controller.ts
@@ -40,7 +40,7 @@ export class LogsController {
   @ApiQuery({
     name: "level",
     required: false,
-    description: "로그 레벨 필터",
+    description: "로그 레벨 필터 (대소문자 무관)",
     enum: ["DEBUG", "INFO", "WARN", "ERROR"],
     example: "ERROR",
   })
diff --git a/backend/src/shared/apm/logs/dto/log-event.dto.ts b/backend/src/shared/apm/logs/dto/log-event.dto.ts
index 53f8533..57c0426 100644
--- a/backend/src/shared/apm/logs/dto/log-event.dto.ts
+++ b/backend/src/shared/apm/logs/dto/log-event.dto.ts
@@ -1,3 +1,4 @@
+import { Transform } from "class-transformer";
 import {
   IsISO8601,
   IsIn,
@@ -23,6 +24,9 @@ export class LogEventDto {
   environment!: string;
 
   @IsString()
+  @Transform(({ value }) =>
+    typeof value === "string" ? value.toUpperCase() : value,
+  )
   @IsIn(["DEBUG", "INFO", "WARN", "ERROR"])
   level!: "DEBUG" | "INFO" | "WARN" | "ERROR";