diff --git a/backend/app/Controllers/SetController.php b/backend/app/Controllers/SetController.php
index 239963f..a3c89f6 100644
--- a/backend/app/Controllers/SetController.php
+++ b/backend/app/Controllers/SetController.php
@@ -9,6 +9,8 @@ use App\Set\Set as DomainSet;
 use App\Set\SetRepository;
 use App\Set\UseCases\CreateSetWithRoot\CreateSetWithRoot;
 use App\Set\UseCases\CreateSetWithRoot\CreateSetWithRootRequest;
+use App\Set\UseCases\DeleteSet\DeleteSet;
+use App\Set\UseCases\DeleteSet\DeleteSetRequest;
 use App\Set\UseCases\UpdateSet\UpdateSet;
 use App\Set\UseCases\UpdateSet\UpdateSetRequest;
 use App\Shared\Files\Filesystem;
@@ -23,6 +25,7 @@ class SetController
         private ElementRepository $elementRepository,
         private CreateSetWithRoot $createSetWithRoot,
         private UpdateSet $updateSet,
+        private DeleteSet $deleteSet,
         private Filesystem $filesystem,
     ) {
     }
@@ -96,6 +99,23 @@ class SetController
         ], 200);
     }
 
+    public function delete(?int $id): JsonResponse
+    {
+        try {
+            $this->deleteSet->execute(new DeleteSetRequest(id: $id));
+        } catch (BadRequestException $exception) {
+            return new JsonResponse([
+                'error' => $exception->getMessage(),
+            ], 400);
+        } catch (NotFoundException $exception) {
+            return new JsonResponse([
+                'error' => $exception->getMessage(),
+            ], 404);
+        }
+
+        return new JsonResponse(null, 204);
+    }
+
     /**
      * @return array{
      *     id: int,
diff --git a/backend/app/Set/UseCases/DeleteSet/DeleteSet.php b/backend/app/Set/UseCases/DeleteSet/DeleteSet.php
new file mode 100644
index 0000000..9ff51a7
--- /dev/null
+++ b/backend/app/Set/UseCases/DeleteSet/DeleteSet.php
@@ -0,0 +1,115 @@
+<?php
+
+namespace App\Set\UseCases\DeleteSet;
+
+use App\Element\Element;
+use App\Element\ElementRepository;
+use App\Exceptions\BadRequestException;
+use App\Exceptions\NotFoundException;
+use App\Set\SetRepository;
+use App\Shared\Files\Filesystem;
+
+class DeleteSet
+{
+    /**
+     * @var array<string, true>
+     */
+    private array $managedFilePaths = [];
+
+    public function __construct(
+        private SetRepository $setRepository,
+        private ElementRepository $elementRepository,
+        private Filesystem $filesystem,
+    ) {
+    }
+
+    /**
+     * @throws BadRequestException
+     * @throws NotFoundException
+     */
+    public function execute(DeleteSetRequest $request): void
+    {
+        if ($request->id === null) {
+            throw new BadRequestException('setId is required');
+        }
+
+        $set = $this->setRepository->find($request->id);
+        if ($set === null) {
+            throw new NotFoundException('Set not found');
+        }
+
+        $this->managedFilePaths = [];
+        $this->rememberManagedFile($set->getIconImageUrl());
+
+        $elements = $this->elementRepository->findBySet($set);
+        foreach ($elements as $element) {
+            $this->rememberManagedFile($element->getIconImageUrl());
+            $this->rememberManagedFile($element->getShortPdfPath());
+            $this->rememberManagedFile($element->getLongPdfPath());
+        }
+
+        foreach ($this->deepestElementsFirst($elements) as $element) {
+            $this->elementRepository->delete($element);
+        }
+
+        $this->setRepository->delete($set);
+        foreach (array_keys($this->managedFilePaths) as $path) {
+            $this->filesystem->delete($path);
+        }
+    }
+
+    /**
+     * @param Element[] $elements
+     * @return Element[]
+     */
+    private function deepestElementsFirst(array $elements): array
+    {
+        usort($elements, function (
+            Element $firstElement,
+            Element $secondElement,
+        ): int {
+            $firstDepth = $this->elementDepth($firstElement);
+            $secondDepth = $this->elementDepth($secondElement);
+            if ($firstDepth === $secondDepth) {
+                return $secondElement->getId() <=> $firstElement->getId();
+            }
+
+            return $secondDepth <=> $firstDepth;
+        });
+
+        return $elements;
+    }
+
+    private function elementDepth(Element $element): int
+    {
+        $depth = 0;
+        $parentElement = $element->getParentElement();
+        while ($parentElement !== null) {
+            $depth++;
+            $parentElement = $parentElement->getParentElement();
+        }
+
+        return $depth;
+    }
+
+    private function rememberManagedFile(?string $path): void
+    {
+        if ($path === null) {
+            return;
+        }
+
+        if (! $this->isManagedFilePath($path)) {
+            return;
+        }
+
+        $this->managedFilePaths[$path] = true;
+    }
+
+    private function isManagedFilePath(string $path): bool
+    {
+        return str_starts_with($path, 'set-icons/')
+            || str_starts_with($path, 'element-icons/')
+            || str_starts_with($path, 'element-pdfs/short/')
+            || str_starts_with($path, 'element-pdfs/long/');
+    }
+}
diff --git a/backend/app/Set/UseCases/DeleteSet/DeleteSetRequest.php b/backend/app/Set/UseCases/DeleteSet/DeleteSetRequest.php
new file mode 100644
index 0000000..5954a0c
--- /dev/null
+++ b/backend/app/Set/UseCases/DeleteSet/DeleteSetRequest.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Set\UseCases\DeleteSet;
+
+class DeleteSetRequest
+{
+    public function __construct(public ?int $id)
+    {
+    }
+}
diff --git a/backend/routes/api.php b/backend/routes/api.php
index 5834ea1..12f02d8 100644
--- a/backend/routes/api.php
+++ b/backend/routes/api.php
@@ -15,6 +15,8 @@ Route::post('/sets', [SetController::class, 'create'])
     ->middleware(AuthMiddleware::class);
 Route::post('/sets/{id}/update', [SetController::class, 'update'])
     ->middleware(AuthMiddleware::class);
+Route::delete('/sets/{id}', [SetController::class, 'delete'])
+    ->middleware(AuthMiddleware::class);
 Route::get('/elements/{id}', [ElementController::class, 'show']);
 Route::get('/element-pdfs/{folder}/{fileName}', [
     ElementController::class,