diff --git a/doc/release-notes.md b/doc/release-notes.md
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -11,3 +11,5 @@
    a bug was fixed where sometimes low fee transactions would be accepted via
    `sendrawtransaction` (and be stuck semipermanently, as they would be unable
    to relay to miners).
+ - Added `nTx` return value to `getblock` and `getblockheader` detailing the
+   number of transactions in the returned block.
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -97,6 +97,7 @@
     result.pushKV("bits", strprintf("%08x", blockindex->nBits));
     result.pushKV("difficulty", GetDifficulty(blockindex));
     result.pushKV("chainwork", blockindex->nChainWork.GetHex());
+    result.pushKV("nTx", uint64_t(blockindex->nTx));
 
     if (blockindex->pprev) {
         result.pushKV("previousblockhash",
@@ -137,6 +138,7 @@
     result.pushKV("bits", strprintf("%08x", block.nBits));
     result.pushKV("difficulty", GetDifficulty(blockindex));
     result.pushKV("chainwork", blockindex->nChainWork.GetHex());
+    result.pushKV("nTx", uint64_t(blockindex->nTx));
 
     if (blockindex->pprev) {
         result.pushKV("previousblockhash",
@@ -803,6 +805,8 @@
             "  \"difficulty\" : x.xxx,  (numeric) The difficulty\n"
             "  \"chainwork\" : \"0000...1f3\"     (string) Expected number of "
             "hashes required to produce the current chain (in hex)\n"
+            "  \"nTx\" : n,             (numeric) The number of transactions "
+            "in the block.\n"
             "  \"previousblockhash\" : \"hash\",  (string) The hash of the "
             "previous block\n"
             "  \"nextblockhash\" : \"hash\",      (string) The hash of the "
@@ -908,6 +912,8 @@
             "  \"difficulty\" : x.xxx,  (numeric) The difficulty\n"
             "  \"chainwork\" : \"xxxx\",  (string) Expected number of hashes "
             "required to produce the chain up to this block (in hex)\n"
+            "  \"nTx\" : n,             (numeric) The number of transactions "
+            "in the block.\n"
             "  \"previousblockhash\" : \"hash\",  (string) The hash of the "
             "previous block\n"
             "  \"nextblockhash\" : \"hash\"       (string) The hash of the "
diff --git a/test/functional/feature_pruning.py b/test/functional/feature_pruning.py
--- a/test/functional/feature_pruning.py
+++ b/test/functional/feature_pruning.py
@@ -324,10 +324,18 @@
         assert_raises_rpc_error(
             -1, "Blockchain is too short for pruning", node.pruneblockchain, height(500))
 
+        # Save block transaction count before pruning, assert value
+        block1_details = node.getblock(node.getblockhash(1))
+        assert_equal(block1_details["nTx"], len(block1_details["tx"]))
+
         # mine 6 blocks so we are at height 1001 (i.e., above PruneAfterHeight)
         node.generate(6)
         assert_equal(node.getblockchaininfo()["blocks"], 1001)
 
+        # Pruned block should still know the number of transactions
+        assert_equal(node.getblockheader(node.getblockhash(1))
+                     ["nTx"], block1_details["nTx"])
+
         # negative heights should raise an exception
         assert_raises_rpc_error(-8, "Negative", node.pruneblockchain, -10)
 
diff --git a/test/functional/rpc_blockchain.py b/test/functional/rpc_blockchain.py
--- a/test/functional/rpc_blockchain.py
+++ b/test/functional/rpc_blockchain.py
@@ -233,6 +233,7 @@
         assert_equal(header['confirmations'], 1)
         assert_equal(header['previousblockhash'], secondbesthash)
         assert_is_hex_string(header['chainwork'])
+        assert_equal(header['nTx'], 1)
         assert_is_hash_string(header['hash'])
         assert_is_hash_string(header['previousblockhash'])
         assert_is_hash_string(header['merkleroot'])