diff --git a/app/Models/Tenants/Approval.php b/app/Models/Tenants/Approval.php
index 9ecc871..373e14f 100644
--- a/app/Models/Tenants/Approval.php
+++ b/app/Models/Tenants/Approval.php
@@ -8,6 +8,7 @@
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
 use Illuminate\Database\Eloquent\SoftDeletes;
 
 /**
@@ -55,6 +56,8 @@ class Approval extends Model
         'completed_at',
         'current_step',
         'attachments',
+        'linkable_type',
+        'linkable_id',
         'created_by',
         'updated_by',
         'deleted_by',
@@ -135,6 +138,14 @@ public function referenceSteps(): HasMany
             ->orderBy('step_order');
     }
 
+    /**
+     * 연결 대상 (Document 등)
+     */
+    public function linkable(): MorphTo
+    {
+        return $this->morphTo();
+    }
+
     /**
      * 생성자
      */
diff --git a/app/Services/ApprovalService.php b/app/Services/ApprovalService.php
index 4e4ce2a..46ebf16 100644
--- a/app/Services/ApprovalService.php
+++ b/app/Services/ApprovalService.php
@@ -2,6 +2,7 @@
 
 namespace App\Services;
 
+use App\Models\Documents\Document;
 use App\Models\Tenants\Approval;
 use App\Models\Tenants\ApprovalForm;
 use App\Models\Tenants\ApprovalLine;
@@ -567,7 +568,7 @@ public function show(int $id): Approval
     {
         $tenantId = $this->tenantId();
 
-        return Approval::query()
+        $approval = Approval::query()
             ->where('tenant_id', $tenantId)
             ->with([
                 'form:id,name,code,category,template',
@@ -579,6 +580,19 @@ public function show(int $id): Approval
                 'steps.approver.tenantProfile.department:id,name',
             ])
             ->findOrFail($id);
+
+        // Document 브릿지: 연결된 문서 데이터 로딩
+        if ($approval->linkable_type === Document::class) {
+            $approval->load([
+                'linkable.template',
+                'linkable.template.approvalLines',
+                'linkable.data',
+                'linkable.approvals.user:id,name',
+                'linkable.attachments',
+            ]);
+        }
+
+        return $approval;
     }
 
     /**
@@ -842,6 +856,9 @@ public function approve(int $id, ?string $comment = null): Approval
             $approval->updated_by = $userId;
             $approval->save();
 
+            // Document 브릿지 동기화
+            $this->syncToLinkedDocument($approval);
+
             return $approval->fresh([
                 'form:id,name,code,category',
                 'drafter:id,name',
@@ -895,6 +912,9 @@ public function reject(int $id, string $comment): Approval
             $approval->updated_by = $userId;
             $approval->save();
 
+            // Document 브릿지 동기화
+            $this->syncToLinkedDocument($approval);
+
             return $approval->fresh([
                 'form:id,name,code,category',
                 'drafter:id,name',
@@ -934,6 +954,9 @@ public function cancel(int $id): Approval
             $approval->updated_by = $userId;
             $approval->save();
 
+            // Document 브릿지 동기화 (steps 삭제 전에 실행)
+            $this->syncToLinkedDocument($approval);
+
             // 결재 단계들 삭제
             $approval->steps()->delete();
 
@@ -944,6 +967,57 @@ public function cancel(int $id): Approval
         });
     }
 
+    /**
+     * Approval → Document 브릿지 동기화
+     * 결재 승인/반려/회수 시 연결된 Document의 상태와 결재란을 동기화
+     */
+    private function syncToLinkedDocument(Approval $approval): void
+    {
+        if ($approval->linkable_type !== Document::class) {
+            return;
+        }
+
+        $document = Document::find($approval->linkable_id);
+        if (! $document) {
+            return;
+        }
+
+        // approval_steps → document_approvals 동기화 (승인자 이름/시각 반영)
+        foreach ($approval->steps as $step) {
+            if ($step->status === ApprovalStep::STATUS_PENDING) {
+                continue;
+            }
+
+            $docApproval = $document->approvals()
+                ->where('step', $step->step_order)
+                ->first();
+
+            if ($docApproval) {
+                $docApproval->update([
+                    'status' => strtoupper($step->status),
+                    'acted_at' => $step->acted_at,
+                    'comment' => $step->comment,
+                ]);
+            }
+        }
+
+        // Document 전체 상태 동기화
+        $documentStatus = match ($approval->status) {
+            Approval::STATUS_APPROVED => Document::STATUS_APPROVED,
+            Approval::STATUS_REJECTED => Document::STATUS_REJECTED,
+            Approval::STATUS_CANCELLED => Document::STATUS_CANCELLED,
+            default => Document::STATUS_PENDING,
+        };
+
+        $document->update([
+            'status' => $documentStatus,
+            'completed_at' => in_array($approval->status, [
+                Approval::STATUS_APPROVED,
+                Approval::STATUS_REJECTED,
+            ]) ? now() : null,
+        ]);
+    }
+
     /**
      * 참조 열람 처리
      */
diff --git a/app/Services/DocumentService.php b/app/Services/DocumentService.php
index b4e614c..b939fe9 100644
--- a/app/Services/DocumentService.php
+++ b/app/Services/DocumentService.php
@@ -7,6 +7,10 @@
 use App\Models\Documents\DocumentAttachment;
 use App\Models\Documents\DocumentData;
 use App\Models\Documents\DocumentTemplate;
+use App\Models\Tenants\Approval;
+use App\Models\Tenants\ApprovalForm;
+use App\Models\Tenants\ApprovalLine;
+use App\Models\Tenants\ApprovalStep;
 use Illuminate\Contracts\Pagination\LengthAwarePaginator;
 use Illuminate\Support\Facades\DB;
 use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
@@ -275,6 +279,9 @@ public function submit(int $id): Document
             $document->updated_by = $userId;
             $document->save();
 
+            // Approval 시스템 브릿지: 결재함(/approval/inbox)에 표시되도록 Approval 자동 생성
+            $this->createApprovalBridge($document);
+
             return $document->fresh([
                 'template:id,name,category',
                 'approvals.user:id,name',
@@ -283,6 +290,78 @@ public function submit(int $id): Document
         });
     }
 
+    /**
+     * Document → Approval 브릿지 생성
+     * Document 상신 시 Approval 레코드를 자동 생성하여 /approval/inbox에 표시
+     */
+    private function createApprovalBridge(Document $document): void
+    {
+        $form = ApprovalForm::where('code', 'document')
+            ->where('tenant_id', $document->tenant_id)
+            ->first();
+
+        if (! $form) {
+            return; // 문서 결재 양식 미등록 시 스킵 (기존 동작 유지)
+        }
+
+        // 기존 브릿지가 있으면 스킵 (재상신 방지)
+        $existingApproval = Approval::where('linkable_type', Document::class)
+            ->where('linkable_id', $document->id)
+            ->whereNotIn('status', [Approval::STATUS_CANCELLED])
+            ->first();
+
+        if ($existingApproval) {
+            return;
+        }
+
+        // 문서번호 생성 (Approval 체계)
+        $today = now()->format('Ymd');
+        $lastNumber = Approval::where('tenant_id', $document->tenant_id)
+            ->where('document_number', 'like', "AP-{$today}-%")
+            ->orderByDesc('document_number')
+            ->value('document_number');
+
+        $seq = 1;
+        if ($lastNumber && preg_match('/AP-\d{8}-(\d{4})/', $lastNumber, $matches)) {
+            $seq = (int) $matches[1] + 1;
+        }
+        $documentNumber = sprintf('AP-%s-%04d', $today, $seq);
+
+        $approval = Approval::create([
+            'tenant_id' => $document->tenant_id,
+            'document_number' => $documentNumber,
+            'form_id' => $form->id,
+            'title' => $document->title,
+            'content' => [
+                'document_id' => $document->id,
+                'template_id' => $document->template_id,
+                'document_no' => $document->document_no,
+            ],
+            'status' => Approval::STATUS_PENDING,
+            'drafter_id' => $document->created_by,
+            'drafted_at' => now(),
+            'current_step' => 1,
+            'linkable_type' => Document::class,
+            'linkable_id' => $document->id,
+            'created_by' => $document->updated_by ?? $document->created_by,
+        ]);
+
+        // document_approvals → approval_steps 변환
+        $docApprovals = $document->approvals()
+            ->orderBy('step')
+            ->get();
+
+        foreach ($docApprovals as $docApproval) {
+            ApprovalStep::create([
+                'approval_id' => $approval->id,
+                'step_order' => $docApproval->step,
+                'step_type' => ApprovalLine::STEP_TYPE_APPROVAL,
+                'approver_id' => $docApproval->user_id,
+                'status' => ApprovalStep::STATUS_PENDING,
+            ]);
+        }
+    }
+
     /**
      * 결재 승인
      */
diff --git a/database/migrations/2026_02_27_200000_add_linkable_to_approvals_table.php b/database/migrations/2026_02_27_200000_add_linkable_to_approvals_table.php
new file mode 100644
index 0000000..32901fb
--- /dev/null
+++ b/database/migrations/2026_02_27_200000_add_linkable_to_approvals_table.php
@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * 결재(approvals) 테이블에 연결 대상(linkable) 컬럼 추가
+     * - Document 시스템과 Approval 시스템을 브릿지하기 위한 다형성 관계
+     */
+    public function up(): void
+    {
+        Schema::table('approvals', function (Blueprint $table) {
+            $table->string('linkable_type')->nullable()->after('attachments')->comment('연결 대상 모델 (예: App\\Models\\Documents\\Document)');
+            $table->unsignedBigInteger('linkable_id')->nullable()->after('linkable_type')->comment('연결 대상 ID');
+            $table->index(['linkable_type', 'linkable_id'], 'idx_linkable');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('approvals', function (Blueprint $table) {
+            $table->dropIndex('idx_linkable');
+            $table->dropColumn(['linkable_type', 'linkable_id']);
+        });
+    }
+};