diff --git a/CHANGELOG.md b/CHANGELOG.md
index ae90d4ca940..6db5b53246b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 - [#6185](https://github.com/thanos-io/thanos/pull/6185) Tracing: tracing in OTLP support configuring service_name.
 - [#6192](https://github.com/thanos-io/thanos/pull/6192) Store: add flag `bucket-web-label` to select the label to use as timeline title in web UI
 - [#6167](https://github.com/thanos-io/thanos/pull/6195) Receive: add flag `tsdb.too-far-in-future.time-window` to prevent clock skewed samples to pollute TSDB head and block all valid incoming samples.
+- [#6273](https://github.com/thanos-io/thanos/pull/6273) Mixin: Allow specifying an instance name filter in dashboards
 
 ### Fixed
 
diff --git a/mixin/dashboards/defaults.libsonnet b/mixin/dashboards/defaults.libsonnet
index 77ccc3e1e48..e176f010002 100644
--- a/mixin/dashboards/defaults.libsonnet
+++ b/mixin/dashboards/defaults.libsonnet
@@ -9,6 +9,7 @@ local utils = import '../lib/utils.libsonnet';
     prefix: 'Thanos / ',
     tags: error 'must provide dashboard tags',
     timezone: 'UTC',
+    instance_name_filter: '',
   },
 
   // Automatically add a uid to each dashboard based on the base64 encoding
@@ -37,7 +38,13 @@ local utils = import '../lib/utils.libsonnet';
       ],
 
       templating+: {
-        list+: [
+        // Add optional filter to the datasource template variable
+        list: [
+          if variable.name == 'datasource'
+          then variable { regex: thanos.dashboard.instance_name_filter }
+          else variable
+          for variable in super.list
+        ] + [
           template.interval(
             'interval',
             '5m,10m,30m,1h,6h,12h,auto',