diff --git a/fe/src/__tests__/DownloadClientFormModal.spec.ts b/fe/src/__tests__/DownloadClientFormModal.spec.ts
index 17beed61d..23320dabd 100644
--- a/fe/src/__tests__/DownloadClientFormModal.spec.ts
+++ b/fe/src/__tests__/DownloadClientFormModal.spec.ts
@@ -172,4 +172,47 @@ describe('DownloadClientFormModal', () => {
     expect(calledWith.password).toBe('')
     expect(calledWith.id).toBe('4')
   })
+
+  it('renders URL Base field for qbittorrent and includes it in the test payload when set', async () => {
+    const api = await import('@/services/api')
+    ;(api.testDownloadClient as unknown) = vi.fn(async (config: unknown) => ({
+      success: true,
+      message: 'ok',
+      client: config,
+    }))
+
+    const wrapper = mount(DownloadClientFormModal, {
+      global: { plugins: [createPinia()] },
+      props: { visible: true, editingClient: null },
+    })
+
+    await wrapper.setProps({
+      editingClient: {
+        id: '5',
+        name: 'qbt',
+        type: 'qbittorrent',
+        host: 'qbittorrent.local',
+        port: 8080,
+        isEnabled: true,
+        useSSL: false,
+        downloadPath: '',
+        username: '',
+        password: '',
+        settings: {},
+      },
+    })
+    await wrapper.vm.$nextTick()
+
+    const urlBaseInput = wrapper.find('input[id="urlBase"]')
+    expect(urlBaseInput.exists()).toBe(true)
+
+    await urlBaseInput.setValue('/qbittorrent')
+
+    const testButton = wrapper.find('button.btn-info')
+    await testButton.trigger('click')
+
+    expect(api.testDownloadClient as unknown).toHaveBeenCalled()
+    const calledWith = (api.testDownloadClient as unknown).mock.calls[0][0]
+    expect(calledWith.settings.urlBase).toBe('/qbittorrent')
+  })
 })
diff --git a/fe/src/components/domain/download/DownloadClientFormModal.vue b/fe/src/components/domain/download/DownloadClientFormModal.vue
index baa7df91a..8b9d1ffa1 100644
--- a/fe/src/components/domain/download/DownloadClientFormModal.vue
+++ b/fe/src/components/domain/download/DownloadClientFormModal.vue
@@ -116,15 +116,22 @@
               </Checkbox>
             </div>
 
-            <div class="form-group" v-if="formData.type === 'transmission'">
+            <div class="form-group" v-if="showUrlBase">
               <label for="urlBase">URL Base</label>
               <input
                 id="urlBase"
                 v-model="formData.urlBase"
                 type="text"
-                placeholder="/transmission/rpc"
+                :placeholder="getUrlBasePlaceholder()"
               />
-              <small
+              <small v-if="formData.type === 'qbittorrent'"
+                >Path prefix for qBittorrent instances behind a reverse proxy (e.g.
+                <code>/qbittorrent</code>). Must match the prefix your reverse proxy strips before
+                forwarding to qBittorrent's own root-relative API - qBittorrent itself has no
+                built-in base path setting. Leave blank if qBittorrent is reachable directly at the
+                host/port above.</small
+              >
+              <small v-else
                 >RPC path for the Transmission endpoint. Default is <code>/transmission/rpc</code>.
                 Some seedbox providers use a custom path (e.g. <code>/rpc</code>).</small
               >
@@ -496,6 +503,14 @@ const getPortHelpText = () => {
   return hints[formData.value.type] || 'Port the download client is listening on.'
 }
 
+const showUrlBase = computed(() => {
+  return formData.value.type === 'transmission' || formData.value.type === 'qbittorrent'
+})
+
+const getUrlBasePlaceholder = () => {
+  return formData.value.type === 'qbittorrent' ? '/qbittorrent' : '/transmission/rpc'
+}
+
 const getCategoryHelp = () => {
   if (isUsenet.value) {
     return 'Adding a category specific to Listenarr avoids conflicts with unrelated non-Listenarr downloads. Using a category is optional, but strongly recommended.'
@@ -593,9 +608,7 @@ const testConnection = async () => {
         ...(formData.value.type === 'sabnzbd' && formData.value.apiKey
           ? { apiKey: formData.value.apiKey }
           : {}),
-        ...(formData.value.type === 'transmission' && formData.value.urlBase
-          ? { urlBase: formData.value.urlBase }
-          : {}),
+        ...(showUrlBase.value && formData.value.urlBase ? { urlBase: formData.value.urlBase } : {}),
         ...(formData.value.category && { category: formData.value.category }),
         ...(formData.value.tags && { tags: formData.value.tags }),
         recentPriority: formData.value.recentPriority,
@@ -653,9 +666,7 @@ const handleSubmit = async () => {
         ...(formData.value.type === 'sabnzbd' && formData.value.apiKey
           ? { apiKey: formData.value.apiKey }
           : {}),
-        ...(formData.value.type === 'transmission' && formData.value.urlBase
-          ? { urlBase: formData.value.urlBase }
-          : {}),
+        ...(showUrlBase.value && formData.value.urlBase ? { urlBase: formData.value.urlBase } : {}),
         ...(formData.value.category && { category: formData.value.category }),
         ...(formData.value.tags && { tags: formData.value.tags }),
         recentPriority: formData.value.recentPriority,
diff --git a/listenarr.infrastructure/DownloadClients/Qbittorrent/QBittorrentHelpers.cs b/listenarr.infrastructure/DownloadClients/Qbittorrent/QBittorrentHelpers.cs
index 2ee964c35..f7410d402 100644
--- a/listenarr.infrastructure/DownloadClients/Qbittorrent/QBittorrentHelpers.cs
+++ b/listenarr.infrastructure/DownloadClients/Qbittorrent/QBittorrentHelpers.cs
@@ -69,5 +69,37 @@ public static void LogCategoryFiltering(ILogger logger, string? category)
                 logger.LogInformation("Fetching qBittorrent queue filtered by category: {Category}", category);
             }
         }
+
+        /// <summary>
+        /// Builds the base URL used for every qBittorrent WebAPI call, including an optional
+        /// "urlBase" path prefix from client settings (e.g. "/qbittorrent") for instances that
+        /// sit behind a reverse proxy at a path prefix.
+        /// Unlike Transmission's urlBase (which replaces the whole RPC path to match Transmission's
+        /// own configurable --rpc-url-base setting), qBittorrent has no equivalent server-side base
+        /// path setting, so this is a plain prefix prepended before the fixed "/api/v2/..." routes -
+        /// it must match whatever prefix the reverse proxy strips before forwarding to qBittorrent.
+        /// </summary>
+        /// <param name="client">The download client configuration providing host/port and settings.</param>
+        /// <returns>The authority (scheme://host:port) with the normalized urlBase prefix appended, if configured.</returns>
+        public static string BuildBaseUrl(DownloadClientConfiguration client)
+        {
+            var authority = DownloadClientUriBuilder.BuildAuthority(client);
+            var prefix = ResolveUrlBasePrefix(client);
+            return prefix.Length == 0 ? authority : authority + prefix;
+        }
+
+        private static string ResolveUrlBasePrefix(DownloadClientConfiguration client)
+        {
+            if (client.Settings?.TryGetValue("urlBase", out var urlBaseObj) is true)
+            {
+                var trimmed = urlBaseObj?.ToString()?.Trim().TrimEnd('/');
+                if (!string.IsNullOrEmpty(trimmed))
+                {
+                    return trimmed.StartsWith('/') ? trimmed : "/" + trimmed;
+                }
+            }
+
+            return string.Empty;
+        }
     }
 }
diff --git a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentAddWorkflow.cs b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentAddWorkflow.cs
index 1739841a0..8e1b5a4b8 100644
--- a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentAddWorkflow.cs
+++ b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentAddWorkflow.cs
@@ -28,7 +28,7 @@ public async Task<DownloadClientSubmissionResult> AddAsync(
                 throw new DownloadClientSubmissionException("qBittorrent requires a prepared torrent submission.");
             }
 
-            var baseUrl = DownloadClientUriBuilder.BuildAuthority(client);
+            var baseUrl = QBittorrentHelpers.BuildBaseUrl(client);
             using var httpClient = httpClientFactory.CreateClient(clientType);
 
             try
diff --git a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentAuthSession.cs b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentAuthSession.cs
index 19e986d69..b818fb68d 100644
--- a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentAuthSession.cs
+++ b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentAuthSession.cs
@@ -24,7 +24,7 @@ public QbittorrentAuthSession(ILogger logger)
 
         public async Task<bool> LoginAsync(HttpClient httpClient, DownloadClientConfiguration client, CancellationToken cancellationToken = default)
         {
-            var baseUrl = DownloadClientUriBuilder.BuildAuthority(client);
+            var baseUrl = QBittorrentHelpers.BuildBaseUrl(client);
 
             using var loginData = new FormUrlEncodedContent(
             [
diff --git a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentConnectionTester.cs b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentConnectionTester.cs
index da741b586..ca8b3d306 100644
--- a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentConnectionTester.cs
+++ b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentConnectionTester.cs
@@ -37,7 +37,7 @@ public QbittorrentConnectionTester(IHttpClientFactory httpClientFactory, ILogger
         {
             try
             {
-                var baseUrl = DownloadClientUriBuilder.BuildAuthority(client);
+                var baseUrl = QBittorrentHelpers.BuildBaseUrl(client);
 
                 using var http = _httpClientFactory.CreateClient(_clientType);
                 using var resp = await http.GetAsync($"{baseUrl}/api/v2/app/version", ct);
diff --git a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentImportItemResolver.cs b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentImportItemResolver.cs
index 3fcb32df1..1251a7e00 100644
--- a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentImportItemResolver.cs
+++ b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentImportItemResolver.cs
@@ -118,7 +118,7 @@ public async Task<QueueItem> GetImportItemAsync(
             string hash,
             CancellationToken ct)
         {
-            var baseUrl = DownloadClientUriBuilder.BuildAuthority(client);
+            var baseUrl = QBittorrentHelpers.BuildBaseUrl(client);
 
             try
             {
diff --git a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentImportMarkerWorkflow.cs b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentImportMarkerWorkflow.cs
index abf1cb2e8..56acc4bd8 100644
--- a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentImportMarkerWorkflow.cs
+++ b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentImportMarkerWorkflow.cs
@@ -33,7 +33,7 @@ public async Task<bool> MarkItemAsImportedAsync(DownloadClientConfiguration clie
                 return true; // No-op is success
             }
 
-            var baseUrl = DownloadClientUriBuilder.BuildAuthority(client);
+            var baseUrl = QBittorrentHelpers.BuildBaseUrl(client);
             try
             {
                 using var httpClient = httpClientFactory.CreateClient(clientType);
diff --git a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentItemFetchWorkflow.cs b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentItemFetchWorkflow.cs
index 45a624f1d..b6f48113d 100644
--- a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentItemFetchWorkflow.cs
+++ b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentItemFetchWorkflow.cs
@@ -26,7 +26,7 @@ public async Task<List<DownloadClientItem>> GetItemsAsync(DownloadClientConfigur
             var items = new List<DownloadClientItem>();
             if (client == null) return items;
 
-            var baseUrl = DownloadClientUriBuilder.BuildAuthority(client);
+            var baseUrl = QBittorrentHelpers.BuildBaseUrl(client);
             var categoryFilter = QBittorrentHelpers.BuildCategoryParameter(client.Settings, "&");
 
             try
diff --git a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentQueueFetchWorkflow.cs b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentQueueFetchWorkflow.cs
index bd3c62a0a..b5a9b427b 100644
--- a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentQueueFetchWorkflow.cs
+++ b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentQueueFetchWorkflow.cs
@@ -24,7 +24,7 @@ public async Task<List<QueueItem>> GetQueueAsync(DownloadClientConfiguration cli
             if (client == null) return items;
 
             var isMonitorPoll = ids.Count > 0;
-            var baseUrl = DownloadClientUriBuilder.BuildAuthority(client);
+            var baseUrl = QBittorrentHelpers.BuildBaseUrl(client);
 
             try
             {
diff --git a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentRemovalWorkflow.cs b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentRemovalWorkflow.cs
index 3d2691d5c..24a333a60 100644
--- a/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentRemovalWorkflow.cs
+++ b/listenarr.infrastructure/DownloadClients/Qbittorrent/QbittorrentRemovalWorkflow.cs
@@ -34,7 +34,7 @@ public async Task<bool> RemoveAsync(DownloadClientConfiguration client, string i
             ArgumentNullException.ThrowIfNull(client);
             if (string.IsNullOrEmpty(id)) throw new ArgumentNullException(nameof(id));
 
-            var baseUrl = DownloadClientUriBuilder.BuildAuthority(client);
+            var baseUrl = QBittorrentHelpers.BuildBaseUrl(client);
 
             try
             {
diff --git a/tests/Features/Infrastructure/DownloadClients/Qbittorrent/QbittorrentAdapterTests.cs b/tests/Features/Infrastructure/DownloadClients/Qbittorrent/QbittorrentAdapterTests.cs
index 038abe508..998b62f53 100644
--- a/tests/Features/Infrastructure/DownloadClients/Qbittorrent/QbittorrentAdapterTests.cs
+++ b/tests/Features/Infrastructure/DownloadClients/Qbittorrent/QbittorrentAdapterTests.cs
@@ -98,6 +98,35 @@ public async Task TestConnection_NormalizesHostWithSchemeAndPath()
             Assert.Equal("/api/v2/app/version", uri.AbsolutePath);
         }
 
+        [Fact]
+        public async Task TestConnection_WithUrlBase_PrefixesApiPath()
+        {
+            var mock = _provider.GetRequiredService<QbittorrentApiMock>();
+
+            var client = await _downloadClientConfigurationRepository.SaveAsync(new DownloadClientConfigurationBuilder()
+                .WithHost("192.168.50.111")
+                .WithPort(8080)
+                .WithoutSsl()
+                .WithType("qbittorrent")
+                .WithUsername("admin")
+                .WithPassword("admin")
+                .WithUrlBase("/qbittorrent")
+                .Build());
+
+            var adapter = _provider.GetRequiredService<IDownloadClientGateway>();
+            var (success, message) = await adapter.TestConnectionAsync(client);
+
+            Assert.True(success);
+            Assert.Contains("Successfully connected to qBittorrent", message, StringComparison.OrdinalIgnoreCase);
+            Assert.NotNull(mock.GetLastRequest());
+
+            var uri = mock.GetLastRequest().RequestUri;
+            // Unlike Transmission's urlBase (which replaces the whole RPC path to match Transmission's
+            // own --rpc-url-base setting), qBittorrent has no equivalent server-side base path setting,
+            // so urlBase is a plain prefix: the fixed "/api/v2/..." routes must still follow it.
+            Assert.Equal("/qbittorrent/api/v2/app/version", uri.AbsolutePath);
+        }
+
         [Fact]
         public async Task AddAsync_WhenMagnetAndTorrentUrlAreProvided_UsesVerifiedMagnetHashWithoutDownloading()
         {