diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 167c8095b6..7dba8344db 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -517,6 +517,7 @@ public:
     std::optional<std::string> FetchBlock(NodeId peer_id, const uint256& hash, const CBlockIndex* block_index) override
         EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
     bool GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) const override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
+    void LimitOrphanTxSize(unsigned int nMaxOrphans) override;
     bool IgnoresIncomingTxs() override { return m_ignore_incoming_txs; }
     void SendPings() override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
     void RelayTransaction(const uint256& txid, const uint256& wtxid) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
@@ -1673,6 +1674,12 @@ bool PeerManagerImpl::GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) c
     return true;
 }
 
+void PeerManagerImpl::LimitOrphanTxSize(unsigned int nMaxOrphans)
+{
+    LOCK(cs_main);
+    m_orphanage.LimitOrphans(nMaxOrphans);
+}
+
 int PeerManagerImpl::GetNumberOfPeersWithValidatedDownloads()
 {
     AssertLockHeld(cs_main);
diff --git a/src/net_processing.h b/src/net_processing.h
index 92ab812a9f..690634553f 100644
--- a/src/net_processing.h
+++ b/src/net_processing.h
@@ -7,6 +7,7 @@
 #define BITCOIN_NET_PROCESSING_H
 
 #include <net.h>
+#include <threadsafety.h>
 #include <validationinterface.h>
 
 class AddrMan;
@@ -63,6 +64,7 @@ public:
 
     /** Get statistics from node state */
     virtual bool GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) const = 0;
+    virtual void LimitOrphanTxSize(unsigned int nMaxOrphans) = 0;
 
     /** Whether this node ignores txs received over p2p. */
     virtual bool IgnoresIncomingTxs() = 0;
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index 20bcc5a6f0..b0636d2b44 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -198,6 +198,11 @@ OptionsDialog::OptionsDialog(QWidget* parent, bool enableWallet)
     mempoolreplacement->addItem(QString("with a higher mining fee (no opt-out)"), QVariant("fee,-optin"));
     CreateOptionUI(verticalLayout_Mempool, mempoolreplacement, tr("Transaction &replacement: %s"));
 
+    maxorphantx = new QSpinBox(tabMempool);
+    maxorphantx->setMinimum(0);
+    maxorphantx->setMaximum(std::numeric_limits<int>::max());
+    CreateOptionUI(verticalLayout_Mempool, maxorphantx, tr("Keep at most %s unconnected transactions in memory"));
+
     QGroupBox * const groupBox_Spamfiltering = new QGroupBox(tabMempool);
     groupBox_Spamfiltering->setTitle(tr("Spam filtering"));
     QVBoxLayout * const verticalLayout_Spamfiltering = new QVBoxLayout(groupBox_Spamfiltering);
@@ -442,6 +447,8 @@ void OptionsDialog::setMapper()
     }
     mempoolreplacement->setCurrentIndex(current_mempoolreplacement_index);
 
+    mapper->addMapping(maxorphantx, OptionsModel::maxorphantx);
+
     /* Window */
 #ifndef Q_OS_MACOS
     if (QSystemTrayIcon::isSystemTrayAvailable()) {
diff --git a/src/qt/optionsdialog.h b/src/qt/optionsdialog.h
index 5811844404..aaa8f9a316 100644
--- a/src/qt/optionsdialog.h
+++ b/src/qt/optionsdialog.h
@@ -15,6 +15,7 @@ class QValidatedLineEdit;
 QT_BEGIN_NAMESPACE
 class QBoxLayout;
 class QDataWidgetMapper;
+class QSpinBox;
 class QString;
 class QValueComboBox;
 class QWidget;
@@ -88,6 +89,7 @@ private:
     void CreateOptionUI(QBoxLayout *, QWidget *, const QString& text);
 
     QValueComboBox *mempoolreplacement;
+    QSpinBox *maxorphantx;
 };
 
 #endif // BITCOIN_QT_OPTIONSDIALOG_H
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index 33fa232839..e8b1280840 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -609,6 +609,8 @@ QVariant OptionsModel::getOption(OptionID option, const std::string& suffix) con
         return gArgs.GetBoolArg("-peerblockfilters", DEFAULT_PEERBLOCKFILTERS);
     case mempoolreplacement:
         return CanonicalMempoolReplacement(*this);
+    case maxorphantx:
+        return qlonglong(gArgs.GetIntArg("-maxorphantx", DEFAULT_MAX_ORPHAN_TRANSACTIONS));
     default:
         return QVariant();
     }
@@ -926,6 +928,21 @@ bool OptionsModel::setOption(OptionID option, const QVariant& value, const std::
         }
         break;
     }
+    case maxorphantx:
+    {
+        if (changed()) {
+            unsigned int nMaxOrphanTx = gArgs.GetIntArg("-maxorphantx", DEFAULT_MAX_ORPHAN_TRANSACTIONS);
+            unsigned int nNv = value.toLongLong();
+            std::string strNv = value.toString().toStdString();
+            gArgs.ForceSetArg("-maxorphantx", strNv);
+            gArgs.ModifyRWConfigFile("maxorphantx", strNv);
+            if (nNv < nMaxOrphanTx) {
+                assert(node().context() && node().context()->peerman);
+                node().context()->peerman->LimitOrphanTxSize(nNv);
+            }
+        }
+        break;
+    }
     default:
         break;
     }
diff --git a/src/qt/optionsmodel.h b/src/qt/optionsmodel.h
index 2297c23fa2..38a984331a 100644
--- a/src/qt/optionsmodel.h
+++ b/src/qt/optionsmodel.h
@@ -81,6 +81,7 @@ public:
         peerbloomfilters,       // bool
         peerblockfilters,       // bool
         mempoolreplacement,
+        maxorphantx,
         OptionIDRowCount,
     };