diff --git a/packages/bsky/src/api/app/bsky/actor/getSuggestions.ts b/packages/bsky/src/api/app/bsky/actor/getSuggestions.ts
index af53508a359..34add3f7926 100644
--- a/packages/bsky/src/api/app/bsky/actor/getSuggestions.ts
+++ b/packages/bsky/src/api/app/bsky/actor/getSuggestions.ts
@@ -29,6 +29,9 @@ export default function (server: Server, ctx: AppContext) {
       const hydrateCtx = await ctx.hydrator.createContext({ viewer, labelers })
       const headers = noUndefinedVals({
         'accept-language': req.headers['accept-language'],
+        'x-bsky-topics': Array.isArray(req.headers['x-bsky-topics'])
+          ? req.headers['x-bsky-topics'].join(',')
+          : req.headers['x-bsky-topics'],
       })
       const { resHeaders: resultHeaders, ...result } = await getSuggestions(
         { ...params, hydrateCtx, headers },
diff --git a/packages/bsky/src/api/app/bsky/feed/getFeed.ts b/packages/bsky/src/api/app/bsky/feed/getFeed.ts
index 815a1cb671f..bbd479e1636 100644
--- a/packages/bsky/src/api/app/bsky/feed/getFeed.ts
+++ b/packages/bsky/src/api/app/bsky/feed/getFeed.ts
@@ -46,6 +46,9 @@ export default function (server: Server, ctx: AppContext) {
       const headers = noUndefinedVals({
         authorization: req.headers['authorization'],
         'accept-language': req.headers['accept-language'],
+        'x-bsky-topics': Array.isArray(req.headers['x-bsky-topics'])
+          ? req.headers['x-bsky-topics'].join(',')
+          : req.headers['x-bsky-topics'],
       })
       // @NOTE feed cursors should not be affected by appview swap
       const {
diff --git a/packages/pds/src/api/app/bsky/actor/getSuggestions.ts b/packages/pds/src/api/app/bsky/actor/getSuggestions.ts
index fadcac2e9fc..3eaac00d33b 100644
--- a/packages/pds/src/api/app/bsky/actor/getSuggestions.ts
+++ b/packages/pds/src/api/app/bsky/actor/getSuggestions.ts
@@ -9,7 +9,9 @@ export default function (server: Server, ctx: AppContext) {
     auth: ctx.authVerifier.access,
     handler: async ({ req, auth }) => {
       const requester = auth.credentials.did
-      return pipethrough(ctx, req, requester)
+      return pipethrough(ctx, req, requester, undefined, {
+        reqHeadersToForward: ['x-bsky-topics'],
+      })
     },
   })
 }
diff --git a/packages/pds/src/api/app/bsky/feed/getFeed.ts b/packages/pds/src/api/app/bsky/feed/getFeed.ts
index 601dbba8eed..d9fd008fcb7 100644
--- a/packages/pds/src/api/app/bsky/feed/getFeed.ts
+++ b/packages/pds/src/api/app/bsky/feed/getFeed.ts
@@ -16,7 +16,9 @@ export default function (server: Server, ctx: AppContext) {
           { feed: params.feed },
           await ctx.appviewAuthHeaders(requester),
         )
-      return pipethrough(ctx, req, requester, feed.view.did)
+      return pipethrough(ctx, req, requester, feed.view.did, {
+        reqHeadersToForward: ['x-bsky-topics'],
+      })
     },
   })
 }
diff --git a/packages/pds/src/pipethrough.ts b/packages/pds/src/pipethrough.ts
index 59998d5b81b..4f54e1f84aa 100644
--- a/packages/pds/src/pipethrough.ts
+++ b/packages/pds/src/pipethrough.ts
@@ -9,6 +9,14 @@ import { httpLogger } from './logger'
 import { getServiceEndpoint, noUndefinedVals } from '@atproto/common'
 import AppContext from './context'
 
+type PipethroughOptions = {
+  /**
+   * Request headers to pass-through, in addition to those defined in
+   * {@link REQ_HEADERS_TO_FORWARD}
+   */
+  reqHeadersToForward?: string[]
+}
+
 const defaultService = (
   ctx: AppContext,
   path: string,
@@ -39,12 +47,14 @@ export const pipethrough = async (
   req: express.Request,
   requester?: string,
   audOverride?: string,
+  options?: PipethroughOptions,
 ): Promise<HandlerPipeThrough> => {
   const { url, headers } = await createUrlAndHeaders(
     ctx,
     req,
     requester,
     audOverride,
+    options,
   )
   const reqInit: RequestInit = {
     headers,
@@ -106,6 +116,7 @@ export const createUrlAndHeaders = async (
   req: express.Request,
   requester?: string,
   audOverride?: string,
+  options?: PipethroughOptions,
 ): Promise<{ url: URL; headers: { authorization?: string } }> => {
   const proxyTo = await parseProxyHeader(ctx, req)
   const defaultProxy = defaultService(ctx, req.path)
@@ -121,8 +132,11 @@ export const createUrlAndHeaders = async (
   const headers = requester
     ? (await ctx.serviceAuthHeaders(requester, aud)).headers
     : {}
+  const allowedHeaders = REQ_HEADERS_TO_FORWARD.concat(
+    options?.reqHeadersToForward ?? [],
+  )
   // forward select headers to upstream services
-  for (const header of REQ_HEADERS_TO_FORWARD) {
+  for (const header of allowedHeaders) {
     const val = req.headers[header]
     if (val) {
       headers[header] = val