diff --git a/backend/api/src/main/java/com/yat2/episode/diagnosis/DiagnosisController.java b/backend/api/src/main/java/com/yat2/episode/diagnosis/DiagnosisController.java
index f9c2171ab..2e178c7ef 100644
--- a/backend/api/src/main/java/com/yat2/episode/diagnosis/DiagnosisController.java
+++ b/backend/api/src/main/java/com/yat2/episode/diagnosis/DiagnosisController.java
@@ -8,6 +8,7 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -80,4 +81,18 @@ public ResponseEntity<DiagnosisSummaryRes> createDiagnosis(
         URI location = UriUtil.createLocationUri(resBody.diagnosisId());
         return ResponseEntity.created(location).body(resBody);
     }
+
+    @Operation(summary = "진단 삭제")
+    @ApiResponses({ @ApiResponse(responseCode = "204", description = "삭제 성공") })
+    @ApiErrorCodes({ ErrorCode.INVALID_REQUEST, ErrorCode.DIAGNOSIS_NOT_FOUND, ErrorCode.INTERNAL_ERROR })
+    @DeleteMapping("/{diagnosisId}")
+    public ResponseEntity<Void> deleteDiagnosis(
+            @PathVariable
+            @Positive(message = "Id는 1 이상의 정수여야 합니다.")
+            Integer diagnosisId,
+            @RequestAttribute(USER_ID) Long userId
+    ) {
+        diagnosisService.deleteDiagnosis(diagnosisId, userId);
+        return ResponseEntity.noContent().build();
+    }
 }
diff --git a/backend/api/src/main/java/com/yat2/episode/diagnosis/DiagnosisRepository.java b/backend/api/src/main/java/com/yat2/episode/diagnosis/DiagnosisRepository.java
index 27e82888d..1e4632f6b 100644
--- a/backend/api/src/main/java/com/yat2/episode/diagnosis/DiagnosisRepository.java
+++ b/backend/api/src/main/java/com/yat2/episode/diagnosis/DiagnosisRepository.java
@@ -48,4 +48,6 @@ Optional<DiagnosisResult> findDetailByIdAndUserId(
             @Param("diagnosisId") Integer diagnosisId,
             @Param("userId") Long userId
     );
+
+    Optional<DiagnosisResult> findByIdAndUser_KakaoId(Integer id, Long kakaoId);
 }
diff --git a/backend/api/src/main/java/com/yat2/episode/diagnosis/DiagnosisService.java b/backend/api/src/main/java/com/yat2/episode/diagnosis/DiagnosisService.java
index 2039cacce..e6e84198f 100644
--- a/backend/api/src/main/java/com/yat2/episode/diagnosis/DiagnosisService.java
+++ b/backend/api/src/main/java/com/yat2/episode/diagnosis/DiagnosisService.java
@@ -74,6 +74,14 @@ public DiagnosisDetailRes getDiagnosisDetailById(Integer diagnosisId, Long userI
                                       weaknesses);
     }
 
+    @Transactional
+    public void deleteDiagnosis(Integer diagnosisId, Long userId) {
+        DiagnosisResult diagnosis = diagnosisRepository.findByIdAndUser_KakaoId(diagnosisId, userId)
+                .orElseThrow(() -> new CustomException(ErrorCode.DIAGNOSIS_NOT_FOUND));
+
+        diagnosisRepository.delete(diagnosis);
+    }
+
     private void validateUserJob(User user) {
         if (user.getJob() == null) {
             throw new CustomException(ErrorCode.JOB_NOT_SELECTED);
diff --git a/backend/api/src/test/java/com/yat2/episode/diagnosis/DiagnosisServiceTest.java b/backend/api/src/test/java/com/yat2/episode/diagnosis/DiagnosisServiceTest.java
index 4ecd0115a..2686db03c 100644
--- a/backend/api/src/test/java/com/yat2/episode/diagnosis/DiagnosisServiceTest.java
+++ b/backend/api/src/test/java/com/yat2/episode/diagnosis/DiagnosisServiceTest.java
@@ -361,4 +361,40 @@ void getDiagnosisDetail_noWeaknesses() {
             assertThat(result.weaknesses()).isEmpty();
         }
     }
+
+    @Nested
+    @DisplayName("deleteDiagnosis")
+    class DeleteDiagnosisTest {
+
+        @Test
+        @DisplayName("진단을 성공적으로 삭제한다")
+        void deleteDiagnosis_success() {
+            Integer diagnosisId = 1;
+            Long userId = 1L;
+
+            DiagnosisResult diagnosis = mock(DiagnosisResult.class);
+            when(diagnosisRepository.findByIdAndUser_KakaoId(diagnosisId, userId)).thenReturn(Optional.of(diagnosis));
+
+            diagnosisService.deleteDiagnosis(diagnosisId, userId);
+
+            verify(diagnosisRepository).findByIdAndUser_KakaoId(diagnosisId, userId);
+            verify(diagnosisRepository).delete(diagnosis);
+        }
+
+        @Test
+        @DisplayName("진단이 없거나 내 진단이 아니면 DIAGNOSIS_NOT_FOUND 예외가 발생하고 삭제하지 않는다")
+        void deleteDiagnosis_notFound_throwsException() {
+            Integer diagnosisId = 999;
+            Long userId = 1L;
+
+            when(diagnosisRepository.findByIdAndUser_KakaoId(diagnosisId, userId)).thenReturn(Optional.empty());
+
+            assertThatThrownBy(() -> diagnosisService.deleteDiagnosis(diagnosisId, userId)).isInstanceOf(
+                            CustomException.class).extracting(e -> ((CustomException) e).getErrorCode())
+                    .isEqualTo(ErrorCode.DIAGNOSIS_NOT_FOUND);
+
+            verify(diagnosisRepository).findByIdAndUser_KakaoId(diagnosisId, userId);
+            verify(diagnosisRepository, never()).delete(any(DiagnosisResult.class));
+        }
+    }
 }