diff --git a/doc/release-notes.md b/doc/release-notes.md
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -22,6 +22,8 @@
 - The `importmulti` RPC will now contain a new per-request `warnings`
   field with strings that explain when fields are being ignored or
   inconsistent, if any.
+- The `hdmasterkeyid` return field has been removed from `getaddressinfo` and
+  `getwalletinfo`.  Use `hdseedid` instead.
 
 RPC importprivkey: new label behavior
 -------------------------------------
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -2971,9 +2971,6 @@
                 "/kB\n"
                 "  \"hdseedid\": \"<hash160>\"          (string, optional) the "
                 "Hash160 of the HD seed (only present when HD is enabled)\n"
-                "  \"hdmasterkeyid\": \"<hash160>\"     (string, optional) "
-                "alias for hdseedid retained for backwards-compatibility. Will "
-                "be removed in V0.21.\n"
                 "  \"private_keys_enabled\": true|false (boolean) false if "
                 "privatekeys are disabled for this wallet (enforced watch-only "
                 "wallet)\n"
@@ -3015,7 +3012,6 @@
     obj.pushKV("paytxfee", ValueFromAmount(pwallet->m_pay_tx_fee.GetFeePerK()));
     if (!seed_id.IsNull()) {
         obj.pushKV("hdseedid", seed_id.GetHex());
-        obj.pushKV("hdmasterkeyid", seed_id.GetHex());
     }
     obj.pushKV("private_keys_enabled",
                !pwallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS));
@@ -4231,9 +4227,6 @@
                 "keypath if the key is HD and available\n"
                 "  \"hdseedid\" : \"<hash160>\"      (string, optional) The "
                 "Hash160 of the HD seed\n"
-                "  \"hdmasterkeyid\" : \"<hash160>\" (string, optional) alias "
-                "for hdseedid maintained for backwards compatibility. Will be "
-                "removed in V0.21.\n"
                 "  \"labels\"                      (object) Array of labels "
                 "associated with the address.\n"
                 "    [\n"
@@ -4305,7 +4298,6 @@
         if (!meta->hdKeypath.empty()) {
             ret.pushKV("hdkeypath", meta->hdKeypath);
             ret.pushKV("hdseedid", meta->hd_seed_id.GetHex());
-            ret.pushKV("hdmasterkeyid", meta->hd_seed_id.GetHex());
         }
     }
 
diff --git a/test/functional/wallet_hd.py b/test/functional/wallet_hd.py
--- a/test/functional/wallet_hd.py
+++ b/test/functional/wallet_hd.py
@@ -27,8 +27,6 @@
     def run_test(self):
         # Make sure we use hd, keep masterkeyid
         masterkeyid = self.nodes[1].getwalletinfo()['hdseedid']
-        assert_equal(masterkeyid, self.nodes[1].getwalletinfo()[
-                     'hdmasterkeyid'])
         assert_equal(len(masterkeyid), 40)
 
         # create an internal key
@@ -56,7 +54,6 @@
             hd_info = self.nodes[1].getaddressinfo(hd_add)
             assert_equal(hd_info["hdkeypath"], "m/0'/0'/" + str(i) + "'")
             assert_equal(hd_info["hdseedid"], masterkeyid)
-            assert_equal(hd_info["hdmasterkeyid"], masterkeyid)
             self.nodes[0].sendtoaddress(hd_add, 1)
             self.nodes[0].generate(1)
         self.nodes[0].sendtoaddress(non_hd_add, 1)
@@ -90,7 +87,6 @@
             hd_info_2 = self.nodes[1].getaddressinfo(hd_add_2)
             assert_equal(hd_info_2["hdkeypath"], "m/0'/0'/" + str(i) + "'")
             assert_equal(hd_info_2["hdseedid"], masterkeyid)
-            assert_equal(hd_info_2["hdmasterkeyid"], masterkeyid)
         assert_equal(hd_add, hd_add_2)
         connect_nodes_bi(self.nodes[0], self.nodes[1])
         self.sync_all()
diff --git a/test/functional/wallet_keypool.py b/test/functional/wallet_keypool.py
--- a/test/functional/wallet_keypool.py
+++ b/test/functional/wallet_keypool.py
@@ -22,8 +22,6 @@
         addr_before_encrypting_data = nodes[
             0].getaddressinfo(addr_before_encrypting)
         wallet_info_old = nodes[0].getwalletinfo()
-        assert_equal(wallet_info_old['hdseedid'],
-                     wallet_info_old['hdmasterkeyid'])
         assert addr_before_encrypting_data[
             'hdseedid'] == wallet_info_old['hdseedid']
 
@@ -33,7 +31,6 @@
         addr = nodes[0].getnewaddress()
         addr_data = nodes[0].getaddressinfo(addr)
         wallet_info = nodes[0].getwalletinfo()
-        assert_equal(wallet_info['hdseedid'], wallet_info['hdmasterkeyid'])
         assert addr_before_encrypting_data[
             'hdseedid'] != wallet_info['hdseedid']
         assert addr_data['hdseedid'] == wallet_info['hdseedid']