diff --git a/doc/mod/notification-telegram.md b/doc/mod/notification-telegram.md
index b85d09c..8043716 100644
--- a/doc/mod/notification-telegram.md
+++ b/doc/mod/notification-telegram.md
@@ -58,6 +58,9 @@ Sending notifications to a group is possible as well. Add your bot and the
 *GetIDs Bot* to a group, then use the group's id (which starts with a dash)
 for `TelegramChatId`. Then remove *GetIDs Bot* from group.
 
+Groups can enable the `Topics` feature. Use `TelegramThreadId` to send to a
+specific topic in a group.
+
 Usage and invocation
 --------------------
 
diff --git a/global-config.rsc b/global-config.rsc
index b364a25..2524ded 100644
--- a/global-config.rsc
+++ b/global-config.rsc
@@ -33,6 +33,8 @@
 :global TelegramChatId "";
 #:global TelegramTokenId "123456:ABCDEF-GHI";
 #:global TelegramChatId "12345678";
+# Use this to send notifications to a specific topic in group.
+:global TelegramThreadId "";
 # Using telegram-chat you have to define trusted chat ids (not group ids!)
 # or user names. Groups allow to chat with devices simultaneously.
 #:global TelegramChatIdsTrusted {
diff --git a/global-functions.rsc b/global-functions.rsc
index 99e52f8..42782bc 100644
--- a/global-functions.rsc
+++ b/global-functions.rsc
@@ -15,7 +15,7 @@
 # Git commit id & info, expected configuration version
 :global CommitId "unknown";
 :global CommitInfo "unknown";
-:global ExpectedConfigVersion 133;
+:global ExpectedConfigVersion 134;
 
 # global variables not to be changed by user
 :global GlobalFunctionsReady false;
diff --git a/mod/notification-telegram.rsc b/mod/notification-telegram.rsc
index 23ef942..d04893f 100644
--- a/mod/notification-telegram.rsc
+++ b/mod/notification-telegram.rsc
@@ -22,7 +22,6 @@
 
   :global IsFullyConnected;
   :global LogPrint;
-  :global UrlEncode;
 
   :if ([ $IsFullyConnected ] = false) do={
     $LogPrint debug $0 ("System is not fully connected, not flushing.");
@@ -41,9 +40,7 @@
       :do {
         :local Data ([ /tool/fetch check-certificate=yes-without-crl output=user http-method=post \
           ("https://api.telegram.org/bot" . ($Message->"tokenid") . "/sendMessage") \
-          http-data=("chat_id=" . ($Message->"chatid") . "&disable_notification=" . ($Message->"silent") . \
-          "&reply_to_message_id=" . ($Message->"replyto") . "&disable_web_page_preview=true" . \
-          "&parse_mode=MarkdownV2&text=" . [ $UrlEncode ($Message->"text") ]) as-value ]->"data");
+          http-data=($Message->"http-data") as-value ]->"data");
         :set ($TelegramQueue->$Id);
         :set ($TelegramMessageIDs->[ :tostr ([ :deserialize from=json value=$Data ]->"result"->"message_id") ]) 1;
       } on-error={
@@ -71,6 +68,8 @@
   :global TelegramChatIdOverride;
   :global TelegramMessageIDs;
   :global TelegramQueue;
+  :global TelegramThreadId;
+  :global TelegramThreadIdOverride;
   :global TelegramTokenId;
   :global TelegramTokenIdOverride;
 
@@ -111,6 +110,8 @@
 
   :local ChatId [ $EitherOr ($Notification->"chatid") \
     [ $EitherOr ($TelegramChatIdOverride->($Notification->"origin")) $TelegramChatId ] ];
+  :local ThreadId [ $EitherOr ($Notification->"threadid") \
+    [ $EitherOr ($TelegramThreadIdOverride->($Notification->"origin")) $TelegramThreadId ] ];
   :local TokenId [ $EitherOr ($TelegramTokenIdOverride->($Notification->"origin")) $TelegramTokenId ];
 
   :if ([ :len $TokenId ] = 0 || [ :len $ChatId ] = 0) do={
@@ -145,6 +146,9 @@
       (($LenSum - [ :len $Text ]) * 100 / $LenSum) . "%_!") "plain" "_" ]);
   }
 
+  :local HTTPData ("chat_id=" . $ChatId . "&disable_notification=" . ($Notification->"silent") . \
+      "&reply_to_message_id=" . ($Notification->"replyto") . "&message_thread_id=" . $ThreadId . \
+       "&disable_web_page_preview=true&parse_mode=MarkdownV2");
   :do {
     :if ([ $CertificateAvailable "Go Daddy Root Certificate Authority - G2" ] = false) do={
       $LogPrint warning $0 ("Downloading required certificate failed.");
@@ -152,9 +156,7 @@
     }
     :local Data ([ /tool/fetch check-certificate=yes-without-crl output=user http-method=post \
       ("https://api.telegram.org/bot" . $TokenId . "/sendMessage") \
-      http-data=("chat_id=" . $ChatId . "&disable_notification=" . ($Notification->"silent") . \
-      "&reply_to_message_id=" . ($Notification->"replyto") . "&disable_web_page_preview=true" . \
-      "&parse_mode=MarkdownV2&text=" . [ $UrlEncode $Text ]) as-value ]->"data");
+      http-data=($HTTPData . "&text=" . [ $UrlEncode $Text ]) as-value ]->"data");
     :set ($TelegramMessageIDs->[ :tostr ([ :deserialize from=json value=$Data ]->"result"->"message_id") ]) 1;
   } on-error={
     $LogPrint info $0 ("Failed sending Telegram notification! Queuing...");
@@ -165,8 +167,8 @@
     :set Text ($Text . "\n" . [ $SymbolForNotification "alarm-clock" ] . \
       [ $EscapeMD ("This message was queued since _" . [ /system/clock/get date ] . \
       " " . [ /system/clock/get time ] . "_ and may be obsolete.") "plain" "_" ]);
-    :set ($TelegramQueue->[ :len $TelegramQueue ]) { chatid=$ChatId; tokenid=$TokenId;
-      text=$Text; silent=($Notification->"silent"); replyto=($Notification->"replyto") };
+    :set ($TelegramQueue->[ :len $TelegramQueue ]) { tokenid=$TokenId;
+      http-data=($HTTPData . "&text=" . [ $UrlEncode $Text ]) };
     :if ([ :len [ /system/scheduler/find where name="_FlushTelegramQueue" ] ] = 0) do={
       /system/scheduler/add name="_FlushTelegramQueue" interval=1m start-time=startup \
         on-event=(":global FlushTelegramQueue; \$FlushTelegramQueue;");
diff --git a/news-and-changes.rsc b/news-and-changes.rsc
index 6f9e96e..a735ff7 100644
--- a/news-and-changes.rsc
+++ b/news-and-changes.rsc
@@ -58,6 +58,7 @@
   131="Enhanced certificate download to fallback to mkcert.org, so all (commonly trusted) root certificates are available now.";
   132="Split off plugins from 'check-health', so the script works on all devices to monitor CPU and RAM. The supported plugins for sensors in hardware are installed automatically.";
   133="Updated the default configuration for 'fw-addr-lists', deprecated lists were removed, a collective list was added.";
+  134="Enhanced 'mod/notification-telegram' and 'telegram-chat' to support topics in groups.";
 };
 
 # Migration steps to be applied on script updates
diff --git a/telegram-chat.rsc b/telegram-chat.rsc
index 10952a6..07e3816 100644
--- a/telegram-chat.rsc
+++ b/telegram-chat.rsc
@@ -97,13 +97,14 @@
   :foreach Update in=($JSON->"result") do={
     :set UpdateID ($Update->"update_id");
     :local Message ($Update->"message");
-    :local IsReply [ :len ($Message->"reply_to_message") ];
+    :local IsReply ([ :typeof ($Message->"reply_to_message") ] = "string");
     :local IsMyReply ($TelegramMessageIDs->[ :tostr ($Message->"reply_to_message"->"message_id") ]);
     :if (($IsMyReply = 1 || $TelegramChatOffset->0 > 0 || $Uptime > 5m) && $UpdateID >= $TelegramChatOffset->2) do={
       :local Trusted false;
       :local Chat ($Message->"chat");
       :local From ($Message->"from");
       :local Command ($Message->"text");
+      :local ThreadId [ $IfThenElse ($Message->"is_topic_message") ($Message->"message_thread_id") "" ];
 
       :foreach IdsTrusted in=($TelegramChatId, $TelegramChatIdsTrusted) do={
         :if ($From->"id" = $IdsTrusted || $From->"username" = $IdsTrusted) do={
@@ -115,7 +116,8 @@
         :local Done false;
         :if ($Command = "?") do={
           $LogPrint info $ScriptName ("Sending notice for update " . $UpdateID . ".");
-          $SendTelegram2 ({ origin=$ScriptName; chatid=($Chat->"id"); silent=true; replyto=($Message->"message_id"); \
+          $SendTelegram2 ({ origin=$ScriptName; chatid=($Chat->"id"); silent=true; \
+            replyto=($Message->"message_id"); threadid=$ThreadId; \
             subject=([ $SymbolForNotification "speech-balloon" ] . "Telegram Chat"); \
             message=("Online" . [ $IfThenElse $TelegramChatActive " (and active!)" ] . ", awaiting your commands!") });
           :set Done true;
@@ -130,7 +132,8 @@
             " from update " . $UpdateID . "!");
           :set Done true;
         }
-        :if ($Done = false && ($IsMyReply = 1 || ($IsReply = 0 && $TelegramChatActive = true)) && [ :len $Command ] > 0) do={
+        :if ($Done = false && ($IsMyReply = 1 || ($IsReply = false && \
+             $TelegramChatActive = true)) && [ :len $Command ] > 0) do={
           :if ([ $ValidateSyntax $Command ] = true) do={
             :local State "";
             :local File ("tmpfs/telegram-chat/" . [ $GetRandom20CharAlNum 6 ]);
@@ -149,7 +152,8 @@
               :set State ([ $SymbolForNotification "cross-mark" ] . "The command failed with an error!\n\n");
             }
             :local Content ([ /file/read chunk-size=32768 file=$File as-value ]->"data");
-            $SendTelegram2 ({ origin=$ScriptName; chatid=($Chat->"id"); silent=true; replyto=($Message->"message_id"); \
+            $SendTelegram2 ({ origin=$ScriptName; chatid=($Chat->"id"); silent=true; \
+              replyto=($Message->"message_id"); threadid=$ThreadId; \
               subject=([ $SymbolForNotification "speech-balloon" ] . "Telegram Chat"); \
               message=([ $SymbolForNotification "gear" ] . "Command:\n" . $Command . "\n\n" . \
                 $State . [ $IfThenElse ([ :len $Content ] > 0) \
@@ -158,7 +162,8 @@
             $RmDir "tmpfs/telegram-chat";
           } else={
             $LogPrint info $ScriptName ("The command from update " . $UpdateID . " failed syntax validation!");
-            $SendTelegram2 ({ origin=$ScriptName; chatid=($Chat->"id"); silent=false; replyto=($Message->"message_id"); \
+            $SendTelegram2 ({ origin=$ScriptName; chatid=($Chat->"id"); silent=false; \
+              replyto=($Message->"message_id"); threadid=$ThreadId; \
               subject=([ $SymbolForNotification "speech-balloon" ] . "Telegram Chat"); \
               message=([ $SymbolForNotification "gear" ] . "Command:\n" . $Command . "\n\n" . \
                 [ $SymbolForNotification "cross-mark" ] . "The command failed syntax validation!") });
@@ -170,7 +175,8 @@
           " (ID " . $From->"id" . ") in update " . $UpdateID . "!");
         :if ($Command ~ ("^! *" . [ $EscapeForRegEx $Identity ] . "\$")) do={
           $LogPrint warning $ScriptName $MessageText;
-          $SendTelegram2 ({ origin=$ScriptName; chatid=($Chat->"id"); silent=false; replyto=($Message->"message_id"); \
+          $SendTelegram2 ({ origin=$ScriptName; chatid=($Chat->"id"); silent=false; \
+            replyto=($Message->"message_id"); threadid=$ThreadId; \
             subject=([ $SymbolForNotification "speech-balloon" ] . "Telegram Chat"); \
             message=("You are not trusted.") });
         } else={