diff --git a/data/countries/AU.yaml b/data/countries/AU.yaml
index c9d5e1bf..00fb231e 100644
--- a/data/countries/AU.yaml
+++ b/data/countries/AU.yaml
@@ -90,12 +90,25 @@ holidays:
           1st monday in October:
             name:
               en: Labour Day
-      # @source https://www.legislation.nsw.gov.au/~/pdf/view/act/2010/115/whole
+      # @source https://www.legislation.nsw.gov.au/view/whole/html/inforce/current/act-2010-115
+      # @source https://www.legislation.nsw.gov.au/view/whole/html/inforce/current/sl-2011-0081
       NSW:
         name: New South Wales
         zones:
           - Australia/Sydney
         days:
+          04-25 and if saturday then next monday:
+            substitute: true
+            name:
+              en: Anzac Day
+            active:
+              - to: "2026-04-25"
+          04-25 and if saturday,sunday then next monday:
+            substitute: true
+            name:
+              en: Anzac Day
+            active:
+              - from: "2026-04-25"
           2nd monday in June:
             name:
               en: Queen's Birthday
diff --git a/test/fixtures/AU-NSW-2015.json b/test/fixtures/AU-NSW-2015.json
index 9a71aa59..490271cb 100644
--- a/test/fixtures/AU-NSW-2015.json
+++ b/test/fixtures/AU-NSW-2015.json
@@ -62,6 +62,16 @@
     "rule": "04-25",
     "_weekday": "Sat"
   },
+  {
+    "date": "2015-04-27 00:00:00",
+    "start": "2015-04-26T14:00:00.000Z",
+    "end": "2015-04-27T14:00:00.000Z",
+    "name": "Anzac Day (substitute day)",
+    "type": "public",
+    "substitute": true,
+    "rule": "04-25 and if saturday then next monday",
+    "_weekday": "Mon"
+  },
   {
     "date": "2015-05-10 00:00:00",
     "start": "2015-05-09T14:00:00.000Z",
diff --git a/test/fixtures/AU-NSW-2020.json b/test/fixtures/AU-NSW-2020.json
index 686c327c..badab8fa 100644
--- a/test/fixtures/AU-NSW-2020.json
+++ b/test/fixtures/AU-NSW-2020.json
@@ -62,6 +62,16 @@
     "rule": "04-25",
     "_weekday": "Sat"
   },
+  {
+    "date": "2020-04-27 00:00:00",
+    "start": "2020-04-26T14:00:00.000Z",
+    "end": "2020-04-27T14:00:00.000Z",
+    "name": "Anzac Day (substitute day)",
+    "type": "public",
+    "substitute": true,
+    "rule": "04-25 and if saturday then next monday",
+    "_weekday": "Mon"
+  },
   {
     "date": "2020-05-10 00:00:00",
     "start": "2020-05-09T14:00:00.000Z",
diff --git a/test/fixtures/AU-NSW-2026.json b/test/fixtures/AU-NSW-2026.json
index 84dd3d9c..f1699d10 100644
--- a/test/fixtures/AU-NSW-2026.json
+++ b/test/fixtures/AU-NSW-2026.json
@@ -62,6 +62,16 @@
     "rule": "04-25",
     "_weekday": "Sat"
   },
+  {
+    "date": "2026-04-27 00:00:00",
+    "start": "2026-04-26T14:00:00.000Z",
+    "end": "2026-04-27T14:00:00.000Z",
+    "name": "Anzac Day (substitute day)",
+    "type": "public",
+    "substitute": true,
+    "rule": "04-25 and if saturday,sunday then next monday",
+    "_weekday": "Mon"
+  },
   {
     "date": "2026-05-10 00:00:00",
     "start": "2026-05-09T14:00:00.000Z",
diff --git a/test/fixtures/AU-NSW-2027.json b/test/fixtures/AU-NSW-2027.json
index 690e9710..a5a08542 100644
--- a/test/fixtures/AU-NSW-2027.json
+++ b/test/fixtures/AU-NSW-2027.json
@@ -62,6 +62,16 @@
     "rule": "04-25",
     "_weekday": "Sun"
   },
+  {
+    "date": "2027-04-26 00:00:00",
+    "start": "2027-04-25T14:00:00.000Z",
+    "end": "2027-04-26T14:00:00.000Z",
+    "name": "Anzac Day (substitute day)",
+    "type": "public",
+    "substitute": true,
+    "rule": "04-25 and if saturday,sunday then next monday",
+    "_weekday": "Mon"
+  },
   {
     "date": "2027-05-09 00:00:00",
     "start": "2027-05-08T14:00:00.000Z",