diff --git a/app/Http/Controllers/V1/ProcessStepController.php b/app/Http/Controllers/V1/ProcessStepController.php
new file mode 100644
index 0000000..7b48a2a
--- /dev/null
+++ b/app/Http/Controllers/V1/ProcessStepController.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace App\Http\Controllers\V1;
+
+use App\Helpers\ApiResponse;
+use App\Http\Controllers\Controller;
+use App\Http\Requests\V1\ProcessStep\ReorderProcessStepRequest;
+use App\Http\Requests\V1\ProcessStep\StoreProcessStepRequest;
+use App\Http\Requests\V1\ProcessStep\UpdateProcessStepRequest;
+use App\Services\ProcessStepService;
+use Illuminate\Http\JsonResponse;
+
+class ProcessStepController extends Controller
+{
+    public function __construct(
+        private readonly ProcessStepService $processStepService
+    ) {}
+
+    /**
+     * 공정 단계 목록 조회
+     */
+    public function index(int $processId): JsonResponse
+    {
+        return ApiResponse::handle(
+            fn () => $this->processStepService->index($processId),
+            'message.fetched'
+        );
+    }
+
+    /**
+     * 공정 단계 상세 조회
+     */
+    public function show(int $processId, int $stepId): JsonResponse
+    {
+        return ApiResponse::handle(
+            fn () => $this->processStepService->show($processId, $stepId),
+            'message.fetched'
+        );
+    }
+
+    /**
+     * 공정 단계 생성
+     */
+    public function store(StoreProcessStepRequest $request, int $processId): JsonResponse
+    {
+        return ApiResponse::handle(
+            fn () => $this->processStepService->store($processId, $request->validated()),
+            'message.created'
+        );
+    }
+
+    /**
+     * 공정 단계 수정
+     */
+    public function update(UpdateProcessStepRequest $request, int $processId, int $stepId): JsonResponse
+    {
+        return ApiResponse::handle(
+            fn () => $this->processStepService->update($processId, $stepId, $request->validated()),
+            'message.updated'
+        );
+    }
+
+    /**
+     * 공정 단계 삭제
+     */
+    public function destroy(int $processId, int $stepId): JsonResponse
+    {
+        return ApiResponse::handle(
+            fn () => $this->processStepService->destroy($processId, $stepId),
+            'message.deleted'
+        );
+    }
+
+    /**
+     * 공정 단계 순서 변경
+     */
+    public function reorder(ReorderProcessStepRequest $request, int $processId): JsonResponse
+    {
+        return ApiResponse::handle(
+            fn () => $this->processStepService->reorder($processId, $request->validated('items')),
+            'message.reordered'
+        );
+    }
+}
diff --git a/app/Http/Requests/V1/ProcessStep/ReorderProcessStepRequest.php b/app/Http/Requests/V1/ProcessStep/ReorderProcessStepRequest.php
new file mode 100644
index 0000000..8e254e9
--- /dev/null
+++ b/app/Http/Requests/V1/ProcessStep/ReorderProcessStepRequest.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Http\Requests\V1\ProcessStep;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class ReorderProcessStepRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'items' => ['required', 'array', 'min:1'],
+            'items.*.id' => ['required', 'integer'],
+            'items.*.sort_order' => ['required', 'integer', 'min:0'],
+        ];
+    }
+
+    public function attributes(): array
+    {
+        return [
+            'items' => '정렬 항목',
+            'items.*.id' => '단계 ID',
+            'items.*.sort_order' => '정렬순서',
+        ];
+    }
+}
diff --git a/app/Http/Requests/V1/ProcessStep/StoreProcessStepRequest.php b/app/Http/Requests/V1/ProcessStep/StoreProcessStepRequest.php
new file mode 100644
index 0000000..543bf95
--- /dev/null
+++ b/app/Http/Requests/V1/ProcessStep/StoreProcessStepRequest.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Http\Requests\V1\ProcessStep;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class StoreProcessStepRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'step_name' => ['required', 'string', 'max:100'],
+            'is_required' => ['nullable', 'boolean'],
+            'needs_approval' => ['nullable', 'boolean'],
+            'needs_inspection' => ['nullable', 'boolean'],
+            'is_active' => ['nullable', 'boolean'],
+            'connection_type' => ['nullable', 'string', 'max:20'],
+            'connection_target' => ['nullable', 'string', 'max:255'],
+            'completion_type' => ['nullable', 'string', 'max:30'],
+        ];
+    }
+
+    public function attributes(): array
+    {
+        return [
+            'step_name' => '단계명',
+            'is_required' => '필수여부',
+            'needs_approval' => '승인필요여부',
+            'needs_inspection' => '검사필요여부',
+            'is_active' => '사용여부',
+            'connection_type' => '연결유형',
+            'connection_target' => '연결대상',
+            'completion_type' => '완료유형',
+        ];
+    }
+}
diff --git a/app/Http/Requests/V1/ProcessStep/UpdateProcessStepRequest.php b/app/Http/Requests/V1/ProcessStep/UpdateProcessStepRequest.php
new file mode 100644
index 0000000..0fc3ca7
--- /dev/null
+++ b/app/Http/Requests/V1/ProcessStep/UpdateProcessStepRequest.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Http\Requests\V1\ProcessStep;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpdateProcessStepRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'step_name' => ['sometimes', 'required', 'string', 'max:100'],
+            'is_required' => ['nullable', 'boolean'],
+            'needs_approval' => ['nullable', 'boolean'],
+            'needs_inspection' => ['nullable', 'boolean'],
+            'is_active' => ['nullable', 'boolean'],
+            'connection_type' => ['nullable', 'string', 'max:20'],
+            'connection_target' => ['nullable', 'string', 'max:255'],
+            'completion_type' => ['nullable', 'string', 'max:30'],
+        ];
+    }
+
+    public function attributes(): array
+    {
+        return [
+            'step_name' => '단계명',
+            'is_required' => '필수여부',
+            'needs_approval' => '승인필요여부',
+            'needs_inspection' => '검사필요여부',
+            'is_active' => '사용여부',
+            'connection_type' => '연결유형',
+            'connection_target' => '연결대상',
+            'completion_type' => '완료유형',
+        ];
+    }
+}
diff --git a/app/Models/Process.php b/app/Models/Process.php
index 49ad213..0c222b4 100644
--- a/app/Models/Process.php
+++ b/app/Models/Process.php
@@ -69,6 +69,14 @@ public function items(): BelongsToMany
             ->orderByPivot('priority');
     }
 
+    /**
+     * 공정 단계
+     */
+    public function steps(): HasMany
+    {
+        return $this->hasMany(ProcessStep::class)->orderBy('sort_order');
+    }
+
     /**
      * 작업지시들
      */
diff --git a/app/Models/ProcessStep.php b/app/Models/ProcessStep.php
new file mode 100644
index 0000000..953fda9
--- /dev/null
+++ b/app/Models/ProcessStep.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class ProcessStep extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'process_id',
+        'step_code',
+        'step_name',
+        'is_required',
+        'needs_approval',
+        'needs_inspection',
+        'is_active',
+        'sort_order',
+        'connection_type',
+        'connection_target',
+        'completion_type',
+    ];
+
+    protected $casts = [
+        'is_required' => 'boolean',
+        'needs_approval' => 'boolean',
+        'needs_inspection' => 'boolean',
+        'is_active' => 'boolean',
+        'sort_order' => 'integer',
+    ];
+
+    /**
+     * 공정
+     */
+    public function process(): BelongsTo
+    {
+        return $this->belongsTo(Process::class);
+    }
+}
diff --git a/app/Services/ProcessService.php b/app/Services/ProcessService.php
index 34fec91..06e3688 100644
--- a/app/Services/ProcessService.php
+++ b/app/Services/ProcessService.php
@@ -25,7 +25,7 @@ public function index(array $params)
 
         $query = Process::query()
             ->where('tenant_id', $tenantId)
-            ->with(['classificationRules', 'processItems.item:id,code,name']);
+            ->with(['classificationRules', 'processItems.item:id,code,name', 'steps']);
 
         // 검색어
         if ($q !== '') {
@@ -62,7 +62,7 @@ public function show(int $id)
         $tenantId = $this->tenantId();
 
         $process = Process::where('tenant_id', $tenantId)
-            ->with(['classificationRules', 'processItems.item:id,code,name'])
+            ->with(['classificationRules', 'processItems.item:id,code,name', 'steps'])
             ->find($id);
 
         if (! $process) {
@@ -104,7 +104,7 @@ public function store(array $data)
             // 개별 품목 연결
             $this->syncProcessItems($process, $itemIds);
 
-            return $process->load(['classificationRules', 'processItems.item:id,code,name']);
+            return $process->load(['classificationRules', 'processItems.item:id,code,name', 'steps']);
         });
     }
 
@@ -145,7 +145,7 @@ public function update(int $id, array $data)
                 $this->syncProcessItems($process, $itemIds);
             }
 
-            return $process->fresh(['classificationRules', 'processItems.item:id,code,name']);
+            return $process->fresh(['classificationRules', 'processItems.item:id,code,name', 'steps']);
         });
     }
 
@@ -201,7 +201,7 @@ public function toggleActive(int $id)
             'updated_by' => $userId,
         ]);
 
-        return $process->fresh(['classificationRules', 'processItems.item:id,code,name']);
+        return $process->fresh(['classificationRules', 'processItems.item:id,code,name', 'steps']);
     }
 
     /**
diff --git a/app/Services/ProcessStepService.php b/app/Services/ProcessStepService.php
new file mode 100644
index 0000000..44fc288
--- /dev/null
+++ b/app/Services/ProcessStepService.php
@@ -0,0 +1,140 @@
+<?php
+
+namespace App\Services;
+
+use App\Models\Process;
+use App\Models\ProcessStep;
+use Illuminate\Support\Facades\DB;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+class ProcessStepService extends Service
+{
+    /**
+     * 공정 단계 목록 조회
+     */
+    public function index(int $processId)
+    {
+        $process = $this->findProcess($processId);
+
+        return $process->steps()
+            ->orderBy('sort_order')
+            ->get();
+    }
+
+    /**
+     * 공정 단계 상세 조회
+     */
+    public function show(int $processId, int $stepId)
+    {
+        $this->findProcess($processId);
+
+        $step = ProcessStep::where('process_id', $processId)->find($stepId);
+        if (! $step) {
+            throw new NotFoundHttpException(__('error.not_found'));
+        }
+
+        return $step;
+    }
+
+    /**
+     * 공정 단계 생성
+     */
+    public function store(int $processId, array $data)
+    {
+        $process = $this->findProcess($processId);
+
+        $data['process_id'] = $process->id;
+        $data['step_code'] = $this->generateStepCode($process->id);
+        $data['sort_order'] = ($process->steps()->max('sort_order') ?? 0) + 1;
+        $data['is_active'] = $data['is_active'] ?? true;
+
+        return ProcessStep::create($data);
+    }
+
+    /**
+     * 공정 단계 수정
+     */
+    public function update(int $processId, int $stepId, array $data)
+    {
+        $this->findProcess($processId);
+
+        $step = ProcessStep::where('process_id', $processId)->find($stepId);
+        if (! $step) {
+            throw new NotFoundHttpException(__('error.not_found'));
+        }
+
+        $step->update($data);
+
+        return $step->fresh();
+    }
+
+    /**
+     * 공정 단계 삭제
+     */
+    public function destroy(int $processId, int $stepId)
+    {
+        $this->findProcess($processId);
+
+        $step = ProcessStep::where('process_id', $processId)->find($stepId);
+        if (! $step) {
+            throw new NotFoundHttpException(__('error.not_found'));
+        }
+
+        $step->delete();
+
+        return true;
+    }
+
+    /**
+     * 공정 단계 순서 변경
+     */
+    public function reorder(int $processId, array $items)
+    {
+        $this->findProcess($processId);
+
+        return DB::transaction(function () use ($processId, $items) {
+            foreach ($items as $item) {
+                ProcessStep::where('process_id', $processId)
+                    ->where('id', $item['id'])
+                    ->update(['sort_order' => $item['sort_order']]);
+            }
+
+            return ProcessStep::where('process_id', $processId)
+                ->orderBy('sort_order')
+                ->get();
+        });
+    }
+
+    /**
+     * 부모 공정 조회 (tenant scope)
+     */
+    private function findProcess(int $processId): Process
+    {
+        $tenantId = $this->tenantId();
+
+        $process = Process::where('tenant_id', $tenantId)->find($processId);
+        if (! $process) {
+            throw new NotFoundHttpException(__('error.not_found'));
+        }
+
+        return $process;
+    }
+
+    /**
+     * 단계코드 자동 생성 (STP-001, STP-002, ...)
+     */
+    private function generateStepCode(int $processId): string
+    {
+        $lastStep = ProcessStep::where('process_id', $processId)
+            ->orderByRaw('CAST(SUBSTRING(step_code, 5) AS UNSIGNED) DESC')
+            ->first();
+
+        if ($lastStep && preg_match('/^STP-(\d+)$/', $lastStep->step_code, $matches)) {
+            $nextNum = (int) $matches[1] + 1;
+        } else {
+            $nextNum = 1;
+        }
+
+        return sprintf('STP-%03d', $nextNum);
+    }
+}
diff --git a/database/migrations/2026_02_03_000001_create_process_steps_table.php b/database/migrations/2026_02_03_000001_create_process_steps_table.php
new file mode 100644
index 0000000..aa7dffc
--- /dev/null
+++ b/database/migrations/2026_02_03_000001_create_process_steps_table.php
@@ -0,0 +1,38 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('process_steps', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('process_id')
+                ->comment('공정 ID')
+                ->constrained('processes')
+                ->cascadeOnDelete();
+            $table->string('step_code', 20)->comment('단계코드 (STP-001)');
+            $table->string('step_name', 100)->comment('단계명');
+            $table->boolean('is_required')->default(false)->comment('필수여부');
+            $table->boolean('needs_approval')->default(false)->comment('승인필요여부');
+            $table->boolean('needs_inspection')->default(false)->comment('검사필요여부');
+            $table->boolean('is_active')->default(true)->comment('사용여부');
+            $table->unsignedInteger('sort_order')->default(0)->comment('정렬순서');
+            $table->string('connection_type', 20)->nullable()->comment('연결유형 (팝업/없음)');
+            $table->string('connection_target', 255)->nullable()->comment('연결대상');
+            $table->string('completion_type', 30)->nullable()->comment('완료유형 (선택완료시완료/클릭시완료)');
+            $table->timestamps();
+
+            $table->unique(['process_id', 'step_code']);
+            $table->index(['process_id', 'is_active', 'sort_order']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('process_steps');
+    }
+};
diff --git a/routes/api/v1/production.php b/routes/api/v1/production.php
index 92aea15..5574549 100644
--- a/routes/api/v1/production.php
+++ b/routes/api/v1/production.php
@@ -13,6 +13,7 @@
 use App\Http\Controllers\Api\V1\WorkOrderController;
 use App\Http\Controllers\Api\V1\WorkResultController;
 use App\Http\Controllers\V1\ProcessController;
+use App\Http\Controllers\V1\ProcessStepController;
 use Illuminate\Support\Facades\Route;
 
 // Process API (공정 관리)
@@ -26,6 +27,16 @@
     Route::put('/{id}', [ProcessController::class, 'update'])->whereNumber('id')->name('v1.processes.update');
     Route::delete('/{id}', [ProcessController::class, 'destroy'])->whereNumber('id')->name('v1.processes.destroy');
     Route::patch('/{id}/toggle', [ProcessController::class, 'toggleActive'])->whereNumber('id')->name('v1.processes.toggle');
+
+    // Process Steps (공정 단계)
+    Route::prefix('{processId}/steps')->whereNumber('processId')->group(function () {
+        Route::get('', [ProcessStepController::class, 'index'])->name('v1.processes.steps.index');
+        Route::post('', [ProcessStepController::class, 'store'])->name('v1.processes.steps.store');
+        Route::patch('/reorder', [ProcessStepController::class, 'reorder'])->name('v1.processes.steps.reorder');
+        Route::get('/{stepId}', [ProcessStepController::class, 'show'])->whereNumber('stepId')->name('v1.processes.steps.show');
+        Route::put('/{stepId}', [ProcessStepController::class, 'update'])->whereNumber('stepId')->name('v1.processes.steps.update');
+        Route::delete('/{stepId}', [ProcessStepController::class, 'destroy'])->whereNumber('stepId')->name('v1.processes.steps.destroy');
+    });
 });
 
 // Work Order API (작업지시 관리)