diff --git a/app/modules/vacation/db.py b/app/modules/vacation/db.py
index b2c92b8..cdd7eca 100644
--- a/app/modules/vacation/db.py
+++ b/app/modules/vacation/db.py
@@ -351,6 +351,23 @@ class VacationDBStore:
             ).fetchone()
         return self._req_serialize(row)
 
+    def hard_delete(self, *, request_id: str, user_email: str, is_admin: bool) -> None:
+        """완전 삭제. 승인 전(작성중/제출/반려)만 허용. owner 또는 admin."""
+        user_email = user_email.lower().strip()
+        current = self.get_request(request_id=request_id)
+        if not current:
+            raise KeyError(request_id)
+        if not is_admin and current["owner"] != user_email:
+            raise PermissionError("본인 신청만 삭제할 수 있습니다.")
+        if current["status"] == "승인":
+            raise ValueError("승인된 휴가는 삭제할 수 없습니다. 취소 처리하세요.")
+        with self._pool.connection() as conn:
+            cur = conn.execute(
+                "DELETE FROM vacation_requests WHERE id = %s", (request_id,)
+            )
+            if cur.rowcount == 0:
+                raise KeyError(request_id)
+
     def list_pending(self) -> list[dict[str, Any]]:
         with self._pool.connection() as conn:
             rows = conn.execute(
diff --git a/app/modules/vacation/router.py b/app/modules/vacation/router.py
index a4601a3..c20fda1 100644
--- a/app/modules/vacation/router.py
+++ b/app/modules/vacation/router.py
@@ -800,3 +800,28 @@ async def cancel(
     except PermissionError as exc:
         raise HTTPException(status_code=403, detail=str(exc))
     return RedirectResponse(url=f"/vacation/{request_id}", status_code=303)
+
+
+@router.post("/{request_id}/delete")
+async def delete(
+    request: Request,
+    request_id: str,
+    user: dict[str, Any] = Depends(_require_user),
+) -> RedirectResponse:
+    """완전 삭제 — 승인 전(작성중/제출/반려)만. 달력으로 복귀."""
+    from app.store import is_admin  # noqa: WPS433
+
+    store = _store(request)
+    if store is None:
+        raise HTTPException(status_code=503, detail="vacation_db 미설정")
+    try:
+        store.hard_delete(
+            request_id=request_id, user_email=user["email"], is_admin=is_admin(user)
+        )
+    except KeyError:
+        raise HTTPException(status_code=404, detail="휴가 신청을 찾을 수 없습니다.")
+    except PermissionError as exc:
+        raise HTTPException(status_code=403, detail=str(exc))
+    except ValueError as exc:
+        raise HTTPException(status_code=409, detail=str(exc))
+    return RedirectResponse(url="/vacation/", status_code=303)
diff --git a/app/modules/vacation/templates/vacation/detail.html b/app/modules/vacation/templates/vacation/detail.html
index 0c826c6..89c0b40 100644
--- a/app/modules/vacation/templates/vacation/detail.html
+++ b/app/modules/vacation/templates/vacation/detail.html
@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/vacation.css?v=20260530d" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/vacation.css?v=20260530e" />{% endblock %}
 
 {% block content %}
 <section class="vac">
@@ -65,11 +65,18 @@
       </form>
       {% endif %}
 
-      {% if req.status != '취소' and (is_owner or is_admin) %}
-      <form method="post" action="/vacation/{{ req.id }}/cancel" class="vac-inline-form"
-            onsubmit="return confirm('이 휴가 신청을 취소 처리할까요?');">
-        <button type="submit" class="erp-btn erp-btn-outline">취소처리</button>
-      </form>
+      {% if (is_owner or is_admin) %}
+        {% if req.status == '승인' %}
+        <form method="post" action="/vacation/{{ req.id }}/cancel" class="vac-inline-form"
+              onsubmit="return confirm('승인된 휴가를 취소 처리할까요?');">
+          <button type="submit" class="erp-btn erp-btn-outline">취소처리</button>
+        </form>
+        {% elif req.status in ('작성중', '제출', '반려') %}
+        <form method="post" action="/vacation/{{ req.id }}/delete" class="vac-inline-form"
+              onsubmit="return confirm('이 휴가 신청을 삭제할까요? (복구 불가)');">
+          <button type="submit" class="erp-btn erp-btn-danger">삭제</button>
+        </form>
+        {% endif %}
       {% endif %}
 
       {% if can_edit %}