diff --git a/backend/src/main/java/codezap/tag/service/TagService.java b/backend/src/main/java/codezap/tag/service/TagService.java
index a1156f5fb..0222be680 100644
--- a/backend/src/main/java/codezap/tag/service/TagService.java
+++ b/backend/src/main/java/codezap/tag/service/TagService.java
@@ -1,6 +1,5 @@
 package codezap.tag.service;
 
-import java.util.ArrayList;
 import java.util.List;
 
 import org.springframework.stereotype.Service;
@@ -25,22 +24,34 @@ public class TagService {
 
     @Transactional
     public void createTags(Template template, List<String> tagNames) {
-        List<Tag> existingTags = new ArrayList<>(tagRepository.findAllByNames(tagNames));
-        List<String> existNames = existingTags.stream()
+        List<Tag> existTags = tagRepository.findAllByNames(tagNames);
+        List<String> existNames = getExistTagNames(existTags);
+
+        List<Tag> newTags = getOnlyNewTags(existNames, tagNames);
+        List<Tag> savedNewTags = tagRepository.saveAll(newTags);
+        existTags.addAll(savedNewTags);
+        saveTemplateTags(template, existTags);
+    }
+
+    private List<String> getExistTagNames(List<Tag> existTags) {
+        return existTags.stream()
                 .map(Tag::getName)
                 .toList();
+    }
+
+    private List<Tag> getOnlyNewTags(List<String> existNames, List<String> tagNames) {
+        return tagNames.stream()
+                .distinct()
+                .filter(name -> !existNames.contains(name))
+                .map(Tag::new)
+                .toList();
+    }
 
-        List<Tag> newTags = tagRepository.saveAll(
-                tagNames.stream()
-                        .filter(name -> !existNames.contains(name))
-                        .map(Tag::new)
-                        .toList()
-        );
-        existingTags.addAll(newTags);
-
-        for (Tag existingTag : existingTags) {
-            templateTagRepository.save(new TemplateTag(template, existingTag));
-        }
+    private void saveTemplateTags(Template template, List<Tag> tags) {
+        List<TemplateTag> templateTags = tags.stream()
+                .map(tag -> new TemplateTag(template, tag))
+                .toList();
+        templateTagRepository.saveAll(templateTags);
     }
 
     public List<Tag> findAllByTemplate(Template template) {
diff --git a/backend/src/test/java/codezap/tag/service/TagServiceTest.java b/backend/src/test/java/codezap/tag/service/TagServiceTest.java
index 5c12fc2b9..e4589eb7c 100644
--- a/backend/src/test/java/codezap/tag/service/TagServiceTest.java
+++ b/backend/src/test/java/codezap/tag/service/TagServiceTest.java
@@ -68,6 +68,23 @@ void createTags_WhenExistTemplateTagContains() {
                     .containsExactlyElementsOf(tagNames);
         }
 
+        @Test
+        @DisplayName("성공: 저장하려는 태그에 중복이 있는 경우 하나만 생성")
+        void createTags_WhenDuplicatedTemplateTag() {
+            // given
+            Template template = createSavedTemplate();
+            String tagName = "tag1";
+            List<String> tagNames = Arrays.asList(tagName, tagName);
+
+            // when
+            sut.createTags(template, tagNames);
+
+            // then
+            List<String> savedTemplateTagNames = getSavedTemplateTagNames(template);
+            assertThat(savedTemplateTagNames).hasSize(1)
+                    .containsExactly(tagName);
+        }
+
         @Test
         @DisplayName("성공: 이미 있는 태그이지만 이 템플릿의 태그가 아닌 경우 템플릿 태그만 추가")
         void createTags_WhenExistTagContains() {