diff --git a/doc/release-notes.md b/doc/release-notes.md
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -5,3 +5,4 @@
 This release includes the following features and fixes:
  - Remove deprecated `estimatepriority` RPC.
  - Remove deprecated `estimatesmartpriority` RPC.
+ - Remove support for `-sendfreetransactions`.
diff --git a/src/qt/coincontroldialog.cpp b/src/qt/coincontroldialog.cpp
--- a/src/qt/coincontroldialog.cpp
+++ b/src/qt/coincontroldialog.cpp
@@ -554,12 +554,6 @@
             std::max(mempoolEstimatePriority, AllowFreeThreshold());
         fAllowFree = (dPriority >= dPriorityNeeded);
 
-        if (fSendFreeTransactions) {
-            if (fAllowFree && nBytes <= MAX_FREE_TRANSACTION_CREATE_SIZE) {
-                nPayFee = Amount(0);
-            }
-        }
-
         if (nPayAmount > Amount(0)) {
             nChange = nAmount - nPayAmount;
             if (!CoinControlDialog::fSubtractFeeFromAmount) nChange -= nPayFee;
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -39,7 +39,6 @@
 extern CFeeRate payTxFee;
 extern unsigned int nTxConfirmTarget;
 extern bool bSpendZeroConfChange;
-extern bool fSendFreeTransactions;
 
 static const unsigned int DEFAULT_KEYPOOL_SIZE = 1000;
 //! -paytxfee default
@@ -56,8 +55,6 @@
 static const Amount MIN_FINAL_CHANGE = MIN_CHANGE / 2;
 //! Default for -spendzeroconfchange
 static const bool DEFAULT_SPEND_ZEROCONF_CHANGE = true;
-//! Default for -sendfreetransactions
-static const bool DEFAULT_SEND_FREE_TRANSACTIONS = false;
 //! Default for -walletrejectlongchains
 static const bool DEFAULT_WALLET_REJECT_LONG_CHAINS = false;
 //! -txconfirmtarget default
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -43,7 +43,6 @@
 CFeeRate payTxFee(DEFAULT_TRANSACTION_FEE);
 unsigned int nTxConfirmTarget = DEFAULT_TX_CONFIRM_TARGET;
 bool bSpendZeroConfChange = DEFAULT_SPEND_ZEROCONF_CHANGE;
-bool fSendFreeTransactions = DEFAULT_SEND_FREE_TRANSACTIONS;
 
 const char *DEFAULT_WALLET_DAT = "wallet.dat";
 const uint32_t BIP32_HARDENED_KEY_LIMIT = 0x80000000;
@@ -4029,13 +4028,6 @@
     strUsage += HelpMessageOpt(
         "-salvagewallet",
         _("Attempt to recover private keys from a corrupt wallet on startup"));
-    if (showDebug) {
-        strUsage += HelpMessageOpt(
-            "-sendfreetransactions",
-            strprintf(_("Send transactions as zero-fee transactions if "
-                        "possible (default: %d)"),
-                      DEFAULT_SEND_FREE_TRANSACTIONS));
-    }
 
     strUsage +=
         HelpMessageOpt("-spendzeroconfchange",
@@ -4493,14 +4485,6 @@
         gArgs.GetArg("-txconfirmtarget", DEFAULT_TX_CONFIRM_TARGET);
     bSpendZeroConfChange =
         gArgs.GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
-    fSendFreeTransactions = gArgs.GetBoolArg("-sendfreetransactions",
-                                             DEFAULT_SEND_FREE_TRANSACTIONS);
-
-    if (fSendFreeTransactions &&
-        gArgs.GetArg("-limitfreerelay", DEFAULT_LIMITFREERELAY) <= 0) {
-        return InitError("Creation of free transactions with their relay "
-                         "disabled is not supported.");
-    }
 
     return true;
 }