diff --git a/man/systemd-cat.xml b/man/systemd-cat.xml
index 040da7c5c2..280492dea5 100644
--- a/man/systemd-cat.xml
+++ b/man/systemd-cat.xml
@@ -123,6 +123,17 @@
         boolean argument.</para></listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><option>--namespace=</option></term>
+
+        <listitem><para>Specifies the journal namespace to which the standard IO should be connected.
+        For details about journal namespaces, see
+        <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+        </para>
+
+        <xi:include href="version-info.xml" xpointer="v256"/></listitem>
+      </varlistentry>
+
     </variablelist>
 
   </refsect1>
@@ -130,8 +141,7 @@
   <refsect1>
     <title>Exit status</title>
 
-    <para>On success, 0 is returned, a non-zero failure code
-    otherwise.</para>
+    <para>On success, 0 is returned, a non-zero failure code otherwise.</para>
   </refsect1>
 
   <refsect1>
diff --git a/src/journal/cat.c b/src/journal/cat.c
index 0325add12f..1634f30b44 100644
--- a/src/journal/cat.c
+++ b/src/journal/cat.c
@@ -24,6 +24,7 @@
 #include "terminal-util.h"
 
 static const char *arg_identifier = NULL;
+static const char *arg_namespace = NULL;
 static int arg_priority = LOG_INFO;
 static int arg_stderr_priority = -1;
 static bool arg_level_prefix = true;
@@ -44,6 +45,7 @@ static int help(void) {
                "  -p --priority=PRIORITY         Set priority value (0..7)\n"
                "     --stderr-priority=PRIORITY  Set priority value (0..7) used for stderr\n"
                "     --level-prefix=BOOL         Control whether level prefix shall be parsed\n"
+               "     --namespace=NAMESPACE       Connect to specified journal namespace\n"
                "\nSee the %s for details.\n",
                program_invocation_short_name,
                ansi_highlight(),
@@ -58,7 +60,8 @@ static int parse_argv(int argc, char *argv[]) {
         enum {
                 ARG_VERSION = 0x100,
                 ARG_STDERR_PRIORITY,
-                ARG_LEVEL_PREFIX
+                ARG_LEVEL_PREFIX,
+                ARG_NAMESPACE,
         };
 
         static const struct option options[] = {
@@ -68,6 +71,7 @@ static int parse_argv(int argc, char *argv[]) {
                 { "priority",        required_argument, NULL, 'p'                 },
                 { "stderr-priority", required_argument, NULL, ARG_STDERR_PRIORITY },
                 { "level-prefix",    required_argument, NULL, ARG_LEVEL_PREFIX    },
+                { "namespace",       required_argument, NULL, ARG_NAMESPACE       },
                 {}
         };
 
@@ -117,6 +121,13 @@ static int parse_argv(int argc, char *argv[]) {
                                 return r;
                         break;
 
+                case ARG_NAMESPACE:
+                        if (isempty(optarg))
+                                arg_namespace = NULL;
+                        else
+                                arg_namespace = optarg;
+                        break;
+
                 case '?':
                         return -EINVAL;
 
@@ -137,12 +148,12 @@ static int run(int argc, char *argv[]) {
         if (r <= 0)
                 return r;
 
-        outfd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix);
+        outfd = sd_journal_stream_fd_with_namespace(arg_namespace, arg_identifier, arg_priority, arg_level_prefix);
         if (outfd < 0)
                 return log_error_errno(outfd, "Failed to create stream fd: %m");
 
         if (arg_stderr_priority >= 0 && arg_stderr_priority != arg_priority) {
-                errfd = sd_journal_stream_fd(arg_identifier, arg_stderr_priority, arg_level_prefix);
+                errfd = sd_journal_stream_fd_with_namespace(arg_namespace, arg_identifier, arg_stderr_priority, arg_level_prefix);
                 if (errfd < 0)
                         return log_error_errno(errfd, "Failed to create stream fd: %m");
         }
diff --git a/test/units/testsuite-04.cat.sh b/test/units/testsuite-04.cat.sh
new file mode 100755
index 0000000000..bef3e189a6
--- /dev/null
+++ b/test/units/testsuite-04.cat.sh
@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+set -eux
+set -o pipefail
+
+systemctl enable --now systemd-journald@cat-test.socket
+
+systemd-cat --namespace cat-test env CAT_TEST_RESULT=1
+
+timeout 30 bash -c "until systemctl -q is-active systemd-journald@cat-test.service; do sleep .5; done"
+
+journalctl --namespace cat-test --grep "JOURNAL_STREAM="
+journalctl --namespace cat-test --grep "CAT_TEST_RESULT=1"
+
+systemctl disable --now systemd-journald@cat-test.socket