diff --git a/lnwallet/wallet.go b/lnwallet/wallet.go
index 6f7863dc5..2dabf056d 100644
--- a/lnwallet/wallet.go
+++ b/lnwallet/wallet.go
@@ -1252,6 +1252,17 @@ func (l *LightningWallet) handleSingleFunderSigs(req *addSingleFunderSigsMsg) {
 	l.limboMtx.Unlock()
 }
 
+// WithCoinSelectLock will execute the passed function closure in a
+// synchronized manner preventing any coin selection operations from proceeding
+// while the closure if executing. This can be seen as the ability to execute a
+// function closure under an exclusive coin selection lock.
+func (l *LightningWallet) WithCoinSelectLock(f func() error) error {
+	l.coinSelectMtx.Lock()
+	defer l.coinSelectMtx.Unlock()
+
+	return f()
+}
+
 // selectCoinsAndChange performs coin selection in order to obtain witness
 // outputs which sum to at least 'numCoins' amount of satoshis. If coin
 // selection is successful/possible, then the selected coins are available
diff --git a/rpcserver.go b/rpcserver.go
index dfd3e8905..a49fea0a4 100644
--- a/rpcserver.go
+++ b/rpcserver.go
@@ -804,7 +804,24 @@ func (r *rpcServer) SendMany(ctx context.Context,
 	rpcsLog.Infof("[sendmany] outputs=%v, sat/kw=%v",
 		spew.Sdump(in.AddrToAmount), int64(feePerKw))
 
-	txid, err := r.sendCoinsOnChain(in.AddrToAmount, feePerKw)
+	var txid *chainhash.Hash
+
+	// We'll attempt to send to the target set of outputs, ensuring that we
+	// synchronize with any other ongoing coin selection attempts which
+	// happen to also be concurrently executing.
+	wallet := r.server.cc.wallet
+	err = wallet.WithCoinSelectLock(func() error {
+		sendManyTXID, err := r.sendCoinsOnChain(
+			in.AddrToAmount, feePerKw,
+		)
+		if err != nil {
+			return err
+		}
+
+		txid = sendManyTXID
+
+		return nil
+	})
 	if err != nil {
 		return nil, err
 	}