diff --git a/icu4c/source/data/mappings/gb18030.ucm b/icu4c/source/data/mappings/gb18030.ucm
index 62b57a93fc24..d317540fb821 100644
--- a/icu4c/source/data/mappings/gb18030.ucm
+++ b/icu4c/source/data/mappings/gb18030.ucm
@@ -3,7 +3,7 @@
 # Copyright (C) 2000-2012, International Business Machines Corporation and others.
 # All Rights Reserved.
 
-# ICU codepage data for GB 18030
+# ICU codepage data for GB 18030-2022
 
 <code_set_name>               "gb18030"
 <char_name_mask>              "AXXXX"
@@ -51,7 +51,7 @@
 
 # GB 18030 BMP mappings that are not handled algorithmically are
 # generated using gbmake4 and gbtoucm tools. Please see charset/source/gb18030/gb18030.html
-# or http://source.icu-project.org/repos/icu/data/trunk/charset/source/gb18030/gb18030.html
+# or https://htmlpreview.github.io/?https://github.com/unicode-org/icu-data/blob/main/charset/source/gb18030/gb18030.html
 # for more information.
 
 CHARMAP
@@ -28077,6 +28077,22 @@ CHARMAP
 <U9FA3> \xFD\x99 |0
 <U9FA4> \xFD\x9A |0
 <U9FA5> \xFD\x9B |0
+<U9FB4> \xFE\x59 |0
+<U9FB4> \x82\x35\x90\x37 |3
+<U9FB5> \xFE\x61 |0
+<U9FB5> \x82\x35\x90\x38 |3
+<U9FB6> \xFE\x66 |0
+<U9FB6> \x82\x35\x90\x39 |3
+<U9FB7> \xFE\x67 |0
+<U9FB7> \x82\x35\x91\x30 |3
+<U9FB8> \xFE\x6D |0
+<U9FB8> \x82\x35\x91\x31 |3
+<U9FB9> \xFE\x7E |0
+<U9FB9> \x82\x35\x91\x32 |3
+<U9FBA> \xFE\x90 |0
+<U9FBA> \x82\x35\x91\x33 |3
+<U9FBB> \xFE\xA0 |0
+<U9FBB> \x82\x35\x91\x34 |3
 <UE000> \xAA\xA1 |0
 <UE001> \xAA\xA2 |0
 <UE002> \xAA\xA3 |0
@@ -30010,16 +30026,16 @@ CHARMAP
 <UE78A> \xA6\xBE |0
 <UE78B> \xA6\xBF |0
 <UE78C> \xA6\xC0 |0
-<UE78D> \xA6\xD9 |0
-<UE78E> \xA6\xDA |0
-<UE78F> \xA6\xDB |0
-<UE790> \xA6\xDC |0
-<UE791> \xA6\xDD |0
-<UE792> \xA6\xDE |0
-<UE793> \xA6\xDF |0
-<UE794> \xA6\xEC |0
-<UE795> \xA6\xED |0
-<UE796> \xA6\xF3 |0
+<UE78D> \xA6\xD9 |1
+<UE78E> \xA6\xDA |1
+<UE78F> \xA6\xDB |1
+<UE790> \xA6\xDC |1
+<UE791> \xA6\xDD |1
+<UE792> \xA6\xDE |1
+<UE793> \xA6\xDF |1
+<UE794> \xA6\xEC |1
+<UE795> \xA6\xED |1
+<UE796> \xA6\xF3 |1
 <UE797> \xA6\xF6 |0
 <UE798> \xA6\xF7 |0
 <UE799> \xA6\xF8 |0
@@ -30155,7 +30171,7 @@ CHARMAP
 <UE81B> \x83\x36\xC9\x37 |0
 <UE81C> \x83\x36\xC9\x38 |0
 <UE81D> \x83\x36\xC9\x39 |0
-<UE81E> \xFE\x59 |0
+<UE81E> \xFE\x59 |1
 <UE81F> \x83\x36\xCA\x30 |0
 <UE820> \x83\x36\xCA\x31 |0
 <UE821> \x83\x36\xCA\x32 |0
@@ -30163,19 +30179,19 @@ CHARMAP
 <UE823> \x83\x36\xCA\x34 |0
 <UE824> \x83\x36\xCA\x35 |0
 <UE825> \x83\x36\xCA\x36 |0
-<UE826> \xFE\x61 |0
+<UE826> \xFE\x61 |1
 <UE827> \x83\x36\xCA\x37 |0
 <UE828> \x83\x36\xCA\x38 |0
 <UE829> \x83\x36\xCA\x39 |0
 <UE82A> \x83\x36\xCB\x30 |0
-<UE82B> \xFE\x66 |0
-<UE82C> \xFE\x67 |0
+<UE82B> \xFE\x66 |1
+<UE82C> \xFE\x67 |1
 <UE82D> \x83\x36\xCB\x31 |0
 <UE82E> \x83\x36\xCB\x32 |0
 <UE82F> \x83\x36\xCB\x33 |0
 <UE830> \x83\x36\xCB\x34 |0
 <UE831> \xFE\x6C |0
-<UE832> \xFE\x6D |0
+<UE832> \xFE\x6D |1
 <UE833> \x83\x36\xCB\x35 |0
 <UE834> \x83\x36\xCB\x36 |0
 <UE835> \x83\x36\xCB\x37 |0
@@ -30192,7 +30208,7 @@ CHARMAP
 <UE840> \x83\x36\xCC\x37 |0
 <UE841> \x83\x36\xCC\x38 |0
 <UE842> \x83\x36\xCC\x39 |0
-<UE843> \xFE\x7E |0
+<UE843> \xFE\x7E |1
 <UE844> \x83\x36\xCD\x30 |0
 <UE845> \x83\x36\xCD\x31 |0
 <UE846> \x83\x36\xCD\x32 |0
@@ -30209,7 +30225,7 @@ CHARMAP
 <UE851> \x83\x36\xCE\x33 |0
 <UE852> \x83\x36\xCE\x34 |0
 <UE853> \x83\x36\xCE\x35 |0
-<UE854> \xFE\x90 |0
+<UE854> \xFE\x90 |1
 <UE855> \xFE\x91 |0
 <UE856> \x83\x36\xCE\x36 |0
 <UE857> \x83\x36\xCE\x37 |0
@@ -30225,7 +30241,7 @@ CHARMAP
 <UE861> \x83\x36\xCF\x37 |0
 <UE862> \x83\x36\xCF\x38 |0
 <UE863> \x83\x36\xCF\x39 |0
-<UE864> \xFE\xA0 |0
+<UE864> \xFE\xA0 |1
 <UF92C> \xFD\x9C |0
 <UF92D> \x84\x30\x85\x35 |0
 <UF92E> \x84\x30\x85\x36 |0
@@ -30480,6 +30496,26 @@ CHARMAP
 <UFA27> \xFE\x4D |0
 <UFA28> \xFE\x4E |0
 <UFA29> \xFE\x4F |0
+<UFE10> \xA6\xD9 |0
+<UFE10> \x84\x31\x82\x36 |3
+<UFE11> \xA6\xDB |0
+<UFE11> \x84\x31\x82\x37 |3
+<UFE12> \xA6\xDA |0
+<UFE12> \x84\x31\x82\x38 |3
+<UFE13> \xA6\xDC |0
+<UFE13> \x84\x31\x82\x39 |3
+<UFE14> \xA6\xDD |0
+<UFE14> \x84\x31\x83\x30 |3
+<UFE15> \xA6\xDE |0
+<UFE15> \x84\x31\x83\x31 |3
+<UFE16> \xA6\xDF |0
+<UFE16> \x84\x31\x83\x32 |3
+<UFE17> \xA6\xEC |0
+<UFE17> \x84\x31\x83\x33 |3
+<UFE18> \xA6\xED |0
+<UFE18> \x84\x31\x83\x34 |3
+<UFE19> \xA6\xF3 |0
+<UFE19> \x84\x31\x83\x35 |3
 <UFE30> \xA9\x55 |0
 <UFE31> \xA6\xF2 |0
 <UFE32> \x84\x31\x85\x38 |0
diff --git a/icu4c/source/test/testdata/conversion.txt b/icu4c/source/test/testdata/conversion.txt
index bc8402fe4a26..290925ef31fa 100644
--- a/icu4c/source/test/testdata/conversion.txt
+++ b/icu4c/source/test/testdata/conversion.txt
@@ -108,10 +108,10 @@ conversion:table(nofallback) {
           :intvector{ 0,1,4,4,4,4,5,5,5,5,6,7,7,7,7,8,9,11 },
           :int{1}, :int{0}, "", "&C", :bin{""}
         }
-        {
+        { // gb18030-2022 changes mapping for 0xFE90
           "gb18030",
           :bin{ 618130fc318130fc8181303c3e813cfc817afe90a8bc },
-          "a\u05ed\\x810\u9f07\\x810<>\\x81<\u9f07z\ue854\u1e3f",
+          "a\u05ed\\x810\u9f07\\x810<>\\x81<\u9f07z\u9fba\u1e3f",
           :intvector{ 0,1,5,5,5,5,6,7,9,9,9,9,10,11,12,13,13,13,13,14,15,17,18,20 },
           :int{1}, :int{0}, "", "&C", :bin{""}
         }
@@ -826,6 +826,27 @@ conversion:table(nofallback) {
           :intvector{ 0, 4, 8, 12 },
           :int{1}, :int{0}, "", "?", :bin{""}
         }
+        { // gb18030->U 2005 vs 2022 part 1 (gb18030 2-byte)
+          "gb18030",
+          :bin{ A6D9 A6DA A6DB A6DC A6DF A6EC A6ED A6F3 FE59 FE61 FE66 FE67 FE6D FE7E FE90 FEA0 },
+          "\uFE10\uFE12\uFE11\uFE13\uFE16\uFE17\uFE18\uFE19\u9FB4\u9FB5\u9FB6\u9FB7\u9FB8\u9FB9\u9FBA\u9FBB", // -2005: "\uE78D\uE78E\uE78F\uE790\uE793\uE794\uE795\uE796\uE81E\uE826\uE82B\uE82C\uE832\uE843\uE854\uE864"
+          :intvector{ 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30 },
+          :int{1}, :int{0}, "", "?", :bin{""}
+        }
+        { // gb18030->U 2005 vs 2022 part 2 (gb18030 4-byte)
+          "gb18030",
+          :bin{ 82359037 82359038 82359039 82359130 82359131 82359132 82359133 82359134 84318236 84318239 84318332 84318335 },
+          "\u9FB4\u9FB5\u9FB6\u9FB7\u9FB8\u9FB9\u9FBA\u9FBB\uFE10\uFE13\uFE16\uFE19", // unchanged from 2005 mapping
+          :intvector{ 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44 },
+          :int{1}, :int{0}, "", "?", :bin{""}
+        }
+        { // gb18030->U 2005 vs 2022 part 3 (gb18030 4-byte), non-changing mappings next to or in linear ranges partially overridden by new explicit maps
+          "gb18030",
+          :bin{ 82358F33823590368235913584318235843183368431843684318537 },
+          "\u9FA6\u9FB3\u9FBC\uFE0F\uFE1A\uFE24\uFE2F",
+          :intvector{ 0, 4, 8, 12, 16, 20, 24 },
+          :int{1}, :int{0}, "", "?", :bin{""}
+        }
         {
           "x11-compound-text",
           :bin{ 1b242944b5ac1b2d41a5e31b2d43d5f51b2d4dd01b2d41411b2d43bc1b2d42ff1b2d54df1b2d44c0b31b2d46b41b2d47b01b2d48e01b2d4ca1 },
@@ -1817,13 +1838,34 @@ conversion:table(nofallback) {
           :intvector{},
           :int{1}, :int{0}, "", "0", ""
         }
-        {
+        { // gb18030-2022 changes mappings for 0xA6DC,0xA6DB
           "gb18030",
-          "\U00020087\ue790\ue78f\u1e3f",
+          "\U00020087\ufe13\ufe11\u1e3f",
           :bin{ 95329031a6dca6dba8bc },
           :intvector{ 0,0,0,0,2,2,3,3,4,4 },
           :int{1}, :int{0}, "", "0", ""
         }
+        { // U->gb18030 2005 vs 2022 part 1 (gb18030 2-byte)
+          "gb18030",
+          "\uFE10\uFE12\uFE11\uFE13\uFE16\uFE17\uFE18\uFE19\u9FB4\u9FB5\u9FB6\u9FB7\u9FB8\u9FB9\u9FBA\u9FBB", // -2005: "\uE78D\uE78E\uE78F\uE790\uE793\uE794\uE795\uE796\uE81E\uE826\uE82B\uE82C\uE832\uE843\uE854\uE864"
+          :bin{ A6D9A6DAA6DBA6DCA6DFA6ECA6EDA6F3FE59FE61FE66FE67FE6DFE7EFE90FEA0 },
+          :intvector{ 0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13,14,14,15,15 },
+          :int{1}, :int{0}, "", "0", ""
+        }
+        { // U->gb18030 2005 vs 2022 part 2 (gb18030 fallback mappings from Unicode PUA)
+          "gb18030",
+          "\uE78D\uE793\uE794\uE795\uE796\uE81E\uE826\uE82B\uE82C\uE832\uE843\uE854\uE864",
+          :bin{ A6D9A6DFA6ECA6EDA6F3FE59FE61FE66FE67FE6DFE7EFE90FEA0 },
+          :intvector{ 0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12 },
+          :int{1}, :int{0}, "", "0", ""
+        }
+        { // U->gb18030 2005 vs 2022 part 3 (gb18030 4-byte), non-changing mappings next to or in linear ranges partially overridden by new explicit maps
+          "gb18030",
+          "\u9FA6\u9FB3\u9FBC\uFE0F\uFE1A\uFE24\uFE2F",
+          :bin{ 82358F33823590368235913584318235843183368431843684318537 },
+          :intvector{ 0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,6,6,6,6 },
+          :int{1}, :int{0}, "", "0", ""
+        }
         {
           "UTF-7",
           "\u00a3I\u00a3\u00a4",
diff --git a/icu4j/main/shared/data/icudata.jar b/icu4j/main/shared/data/icudata.jar
index d2989f6501e3..a2e0daf50910 100644
--- a/icu4j/main/shared/data/icudata.jar
+++ b/icu4j/main/shared/data/icudata.jar
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:149ffc15b2c8445d90afefbbdaffdd446a6d78181e1693d3da178a54811bce8f
-size 14330624
+oid sha256:49f886698feb647c2dcfb10d6f872601280bf8783483456a706dd45549308875
+size 14330800
diff --git a/icu4j/main/shared/data/icutzdata.jar b/icu4j/main/shared/data/icutzdata.jar
index 89153f23c85f..04f3b213463f 100644
--- a/icu4j/main/shared/data/icutzdata.jar
+++ b/icu4j/main/shared/data/icutzdata.jar
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:5d47b16bcbb1d55cde6c82234159dd11daeae9fbc7a639ffa837b7abf43afc17
+oid sha256:2903ecb7a300f5d52e7636addfe2756cbdb00262835a787379d7aa6456c0349a
 size 94829
diff --git a/icu4j/main/shared/data/testdata.jar b/icu4j/main/shared/data/testdata.jar
index 148a56dc59a5..f85b1e6fd6ce 100644
--- a/icu4j/main/shared/data/testdata.jar
+++ b/icu4j/main/shared/data/testdata.jar
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:6478e18e5392984bcb40946bf4ca076e0f9fd04fc18fabf47b8b01f4295b740d
-size 831605
+oid sha256:1cda304595c1fa919460b28de344a541938d5ed91af9f3089ccff9ce2effd440
+size 831983
diff --git a/icu4j/maven-build/maven-icu4j-datafiles/src/main/resources/com/ibm/icu/impl/data/icudt73b/gb18030.cnv b/icu4j/maven-build/maven-icu4j-datafiles/src/main/resources/com/ibm/icu/impl/data/icudt73b/gb18030.cnv
index d27d6fefb9b8..ecd0888e40ed 100644
Binary files a/icu4j/maven-build/maven-icu4j-datafiles/src/main/resources/com/ibm/icu/impl/data/icudt73b/gb18030.cnv and b/icu4j/maven-build/maven-icu4j-datafiles/src/main/resources/com/ibm/icu/impl/data/icudt73b/gb18030.cnv differ
diff --git a/icu4j/maven-build/maven-icu4j-test-datafiles/src/main/resources/com/ibm/icu/dev/data/testdata/conversion.res b/icu4j/maven-build/maven-icu4j-test-datafiles/src/main/resources/com/ibm/icu/dev/data/testdata/conversion.res
index fa88f8faa09a..a61b4b8d676c 100644
Binary files a/icu4j/maven-build/maven-icu4j-test-datafiles/src/main/resources/com/ibm/icu/dev/data/testdata/conversion.res and b/icu4j/maven-build/maven-icu4j-test-datafiles/src/main/resources/com/ibm/icu/dev/data/testdata/conversion.res differ