diff --git a/solr/CHANGES.txt b/solr/CHANGES.txt
index 4a14786eeee..02021c507e5 100644
--- a/solr/CHANGES.txt
+++ b/solr/CHANGES.txt
@@ -405,6 +405,8 @@ Other Changes
 * SOLR-8736: schema GET operations on fields, dynamicFields, fieldTypes, copyField are
   reimplemented as a part of the bulk API with less details (noble)
 
+* SOLR-8766 : deprecated <admin> tag in solrconfig.xml is removed (noble)
+
 ==================  5.5.1 ==================
 
 Bug Fixes
diff --git a/solr/contrib/morphlines-core/src/test-files/solr/collection1/conf/solrconfig.xml b/solr/contrib/morphlines-core/src/test-files/solr/collection1/conf/solrconfig.xml
index b8d1ca66e22..ab1acd9ec55 100644
--- a/solr/contrib/morphlines-core/src/test-files/solr/collection1/conf/solrconfig.xml
+++ b/solr/contrib/morphlines-core/src/test-files/solr/collection1/conf/solrconfig.xml
@@ -1487,11 +1487,5 @@
       EditorialMarkerFactory will do exactly that:
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
-    
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
 
 </config>
diff --git a/solr/contrib/morphlines-core/src/test-files/solr/minimr/conf/solrconfig.xml b/solr/contrib/morphlines-core/src/test-files/solr/minimr/conf/solrconfig.xml
index 65637c19e51..f5ce41b4a71 100644
--- a/solr/contrib/morphlines-core/src/test-files/solr/minimr/conf/solrconfig.xml
+++ b/solr/contrib/morphlines-core/src/test-files/solr/minimr/conf/solrconfig.xml
@@ -1508,10 +1508,4 @@
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
     
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
-
 </config>
diff --git a/solr/contrib/morphlines-core/src/test-files/solr/mrunit/conf/solrconfig.xml b/solr/contrib/morphlines-core/src/test-files/solr/mrunit/conf/solrconfig.xml
index 691643fc90b..d40b16de41d 100644
--- a/solr/contrib/morphlines-core/src/test-files/solr/mrunit/conf/solrconfig.xml
+++ b/solr/contrib/morphlines-core/src/test-files/solr/mrunit/conf/solrconfig.xml
@@ -1511,11 +1511,4 @@
       EditorialMarkerFactory will do exactly that:
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
-    
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
-
 </config>
diff --git a/solr/contrib/morphlines-core/src/test-files/solr/solrcelltest/collection1/conf/solrconfig.xml b/solr/contrib/morphlines-core/src/test-files/solr/solrcelltest/collection1/conf/solrconfig.xml
index b8d1ca66e22..ab1acd9ec55 100644
--- a/solr/contrib/morphlines-core/src/test-files/solr/solrcelltest/collection1/conf/solrconfig.xml
+++ b/solr/contrib/morphlines-core/src/test-files/solr/solrcelltest/collection1/conf/solrconfig.xml
@@ -1487,11 +1487,5 @@
       EditorialMarkerFactory will do exactly that:
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
-    
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
 
 </config>
diff --git a/solr/contrib/morphlines-core/src/test-files/solr/solrcloud/conf/solrconfig.xml b/solr/contrib/morphlines-core/src/test-files/solr/solrcloud/conf/solrconfig.xml
index 336c789ea13..9d33201ba33 100644
--- a/solr/contrib/morphlines-core/src/test-files/solr/solrcloud/conf/solrconfig.xml
+++ b/solr/contrib/morphlines-core/src/test-files/solr/solrcloud/conf/solrconfig.xml
@@ -1510,11 +1510,5 @@
       EditorialMarkerFactory will do exactly that:
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
-    
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
 
 </config>
diff --git a/solr/example/example-DIH/solr/db/conf/solrconfig.xml b/solr/example/example-DIH/solr/db/conf/solrconfig.xml
index e5415657e6a..339e77fcd79 100644
--- a/solr/example/example-DIH/solr/db/conf/solrconfig.xml
+++ b/solr/example/example-DIH/solr/db/conf/solrconfig.xml
@@ -1486,11 +1486,5 @@
       EditorialMarkerFactory will do exactly that:
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
-    
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
 
 </config>
diff --git a/solr/example/example-DIH/solr/mail/conf/solrconfig.xml b/solr/example/example-DIH/solr/mail/conf/solrconfig.xml
index 30c61a8ac04..0698704ddd6 100644
--- a/solr/example/example-DIH/solr/mail/conf/solrconfig.xml
+++ b/solr/example/example-DIH/solr/mail/conf/solrconfig.xml
@@ -1489,11 +1489,5 @@
       EditorialMarkerFactory will do exactly that:
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
-    
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
 
 </config>
diff --git a/solr/example/example-DIH/solr/rss/conf/solrconfig.xml b/solr/example/example-DIH/solr/rss/conf/solrconfig.xml
index a6597a1e7f0..152321e8563 100644
--- a/solr/example/example-DIH/solr/rss/conf/solrconfig.xml
+++ b/solr/example/example-DIH/solr/rss/conf/solrconfig.xml
@@ -1485,11 +1485,5 @@
       EditorialMarkerFactory will do exactly that:
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
-    
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
 
 </config>
diff --git a/solr/example/example-DIH/solr/solr/conf/solrconfig.xml b/solr/example/example-DIH/solr/solr/conf/solrconfig.xml
index 84469d9cdd3..7091b9d9201 100644
--- a/solr/example/example-DIH/solr/solr/conf/solrconfig.xml
+++ b/solr/example/example-DIH/solr/solr/conf/solrconfig.xml
@@ -1485,11 +1485,5 @@
       EditorialMarkerFactory will do exactly that:
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
-    
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
 
 </config>
diff --git a/solr/example/example-DIH/solr/tika/conf/solrconfig.xml b/solr/example/example-DIH/solr/tika/conf/solrconfig.xml
index 9c770a09bae..c3d0168d697 100644
--- a/solr/example/example-DIH/solr/tika/conf/solrconfig.xml
+++ b/solr/example/example-DIH/solr/tika/conf/solrconfig.xml
@@ -1463,11 +1463,4 @@
       EditorialMarkerFactory will do exactly that:
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
-    
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
-
 </config>
diff --git a/solr/example/files/conf/solrconfig.xml b/solr/example/files/conf/solrconfig.xml
index 4dea6c97ad7..cab776a8f39 100644
--- a/solr/example/files/conf/solrconfig.xml
+++ b/solr/example/files/conf/solrconfig.xml
@@ -1505,10 +1505,4 @@
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
 
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
-
 </config>
diff --git a/solr/server/solr/configsets/basic_configs/conf/solrconfig.xml b/solr/server/solr/configsets/basic_configs/conf/solrconfig.xml
index 6b2f7457a94..9ee1ff5fbee 100644
--- a/solr/server/solr/configsets/basic_configs/conf/solrconfig.xml
+++ b/solr/server/solr/configsets/basic_configs/conf/solrconfig.xml
@@ -559,9 +559,4 @@
     </arr>
   </requestHandler>
 
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
-
 </config>
diff --git a/solr/server/solr/configsets/data_driven_schema_configs/conf/solrconfig.xml b/solr/server/solr/configsets/data_driven_schema_configs/conf/solrconfig.xml
index 72d7bdf32b6..6d9c8b53864 100644
--- a/solr/server/solr/configsets/data_driven_schema_configs/conf/solrconfig.xml
+++ b/solr/server/solr/configsets/data_driven_schema_configs/conf/solrconfig.xml
@@ -1479,11 +1479,4 @@
       EditorialMarkerFactory will do exactly that:
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
-
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
-
 </config>
diff --git a/solr/server/solr/configsets/sample_techproducts_configs/conf/solrconfig.xml b/solr/server/solr/configsets/sample_techproducts_configs/conf/solrconfig.xml
index 900a123530b..c8f52a6ae2a 100644
--- a/solr/server/solr/configsets/sample_techproducts_configs/conf/solrconfig.xml
+++ b/solr/server/solr/configsets/sample_techproducts_configs/conf/solrconfig.xml
@@ -1698,10 +1698,4 @@
      <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />
     -->
     
-
-  <!-- Legacy config for the admin interface -->
-  <admin>
-    <defaultQuery>*:*</defaultQuery>
-  </admin>
-
 </config>