diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -132,8 +132,8 @@
 	compat/glibcxx_sanity.cpp
 	compat/strnlen.cpp
 	fs.cpp
-	interface/handler.cpp
-	interface/node.cpp
+	interfaces/handler.cpp
+	interfaces/node.cpp
 	logging.cpp
 	random.cpp
 	rcu.cpp
diff --git a/src/Makefile.am b/src/Makefile.am
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -141,8 +141,8 @@
   httpserver.h \
   indirectmap.h \
   init.h \
-  interface/handler.h \
-  interface/node.h \
+  interfaces/handler.h \
+  interfaces/node.h \
   key.h \
   keystore.h \
   dbwrapper.h \
@@ -432,8 +432,8 @@
   compat/glibcxx_sanity.cpp \
   compat/strnlen.cpp \
   fs.cpp \
-  interface/handler.cpp \
-  interface/node.cpp \
+  interfaces/handler.cpp \
+  interfaces/node.cpp \
   logging.cpp \
   random.cpp \
   rcu.cpp \
diff --git a/src/interface/handler.h b/src/interfaces/handler.h
rename from src/interface/handler.h
rename to src/interfaces/handler.h
--- a/src/interface/handler.h
+++ b/src/interfaces/handler.h
@@ -2,8 +2,8 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef BITCOIN_INTERFACE_HANDLER_H
-#define BITCOIN_INTERFACE_HANDLER_H
+#ifndef BITCOIN_INTERFACES_HANDLER_H
+#define BITCOIN_INTERFACES_HANDLER_H
 
 #include <memory>
 
@@ -13,7 +13,7 @@
 } // namespace signals2
 } // namespace boost
 
-namespace interface {
+namespace interfaces {
 
 //! Generic interface for managing an event handler or callback function
 //! registered with another interface. Has a single disconnect method to cancel
@@ -29,6 +29,6 @@
 //! Return handler wrapping a boost signal connection.
 std::unique_ptr<Handler> MakeHandler(boost::signals2::connection connection);
 
-} // namespace interface
+} // namespace interfaces
 
-#endif // BITCOIN_INTERFACE_HANDLER_H
+#endif // BITCOIN_INTERFACES_HANDLER_H
diff --git a/src/interface/handler.cpp b/src/interfaces/handler.cpp
rename from src/interface/handler.cpp
rename to src/interfaces/handler.cpp
--- a/src/interface/handler.cpp
+++ b/src/interfaces/handler.cpp
@@ -2,7 +2,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include <interface/handler.h>
+#include <interfaces/handler.h>
 
 #include <util.h>
 
@@ -10,7 +10,7 @@
 #include <memory>
 #include <utility>
 
-namespace interface {
+namespace interfaces {
 namespace {
 
     class HandlerImpl : public Handler {
@@ -29,4 +29,4 @@
     return std::make_unique<HandlerImpl>(std::move(connection));
 }
 
-} // namespace interface
+} // namespace interfaces
diff --git a/src/interface/node.h b/src/interfaces/node.h
rename from src/interface/node.h
rename to src/interfaces/node.h
--- a/src/interface/node.h
+++ b/src/interfaces/node.h
@@ -2,8 +2,8 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef BITCOIN_INTERFACE_NODE_H
-#define BITCOIN_INTERFACE_NODE_H
+#ifndef BITCOIN_INTERFACES_NODE_H
+#define BITCOIN_INTERFACES_NODE_H
 
 #include <netaddress.h> // For Network
 
@@ -16,7 +16,7 @@
 class proxyType;
 class RPCServer;
 
-namespace interface {
+namespace interfaces {
 
 class Handler;
 
@@ -93,6 +93,6 @@
 //! Return implementation of Node interface.
 std::unique_ptr<Node> MakeNode();
 
-} // namespace interface
+} // namespace interfaces
 
-#endif // BITCOIN_INTERFACE_NODE_H
+#endif // BITCOIN_INTERFACES_NODE_H
diff --git a/src/interface/node.cpp b/src/interfaces/node.cpp
rename from src/interface/node.cpp
rename to src/interfaces/node.cpp
--- a/src/interface/node.cpp
+++ b/src/interfaces/node.cpp
@@ -2,12 +2,12 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include <interface/node.h>
+#include <interfaces/node.h>
 
 #include <chainparams.h>
 #include <config.h>
 #include <init.h>
-#include <interface/handler.h>
+#include <interfaces/handler.h>
 #include <net.h>
 #include <netaddress.h>
 #include <netbase.h>
@@ -20,7 +20,7 @@
 
 class HTTPRPCRequestProcessor;
 
-namespace interface {
+namespace interfaces {
 namespace {
 
     class NodeImpl : public Node {
@@ -89,4 +89,4 @@
     return std::make_unique<NodeImpl>();
 }
 
-} // namespace interface
+} // namespace interfaces
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -28,8 +28,8 @@
 #endif
 
 #include "init.h"
-#include "interface/handler.h"
-#include "interface/node.h"
+#include "interfaces/handler.h"
+#include "interfaces/node.h"
 #include "rpc/server.h"
 #include "ui_interface.h"
 #include "uint256.h"
@@ -175,7 +175,7 @@
 class BitcoinABC : public QObject {
     Q_OBJECT
 public:
-    explicit BitcoinABC(interface::Node &node);
+    explicit BitcoinABC(interfaces::Node &node);
 
 public Q_SLOTS:
     void initialize(Config *config,
@@ -191,14 +191,14 @@
     /// Pass fatal exception message to UI thread
     void handleRunawayException(const std::exception *e);
 
-    interface::Node &m_node;
+    interfaces::Node &m_node;
 };
 
 /** Main Bitcoin application object */
 class BitcoinApplication : public QApplication {
     Q_OBJECT
 public:
-    explicit BitcoinApplication(interface::Node &node, int &argc, char **argv);
+    explicit BitcoinApplication(interfaces::Node &node, int &argc, char **argv);
     ~BitcoinApplication();
 
 #ifdef ENABLE_WALLET
@@ -242,7 +242,7 @@
 
 private:
     QThread *coreThread;
-    interface::Node &m_node;
+    interfaces::Node &m_node;
     OptionsModel *optionsModel;
     ClientModel *clientModel;
     BitcoinGUI *window;
@@ -260,7 +260,7 @@
 
 #include "bitcoin.moc"
 
-BitcoinABC::BitcoinABC(interface::Node &node) : QObject(), m_node(node) {}
+BitcoinABC::BitcoinABC(interfaces::Node &node) : QObject(), m_node(node) {}
 
 void BitcoinABC::handleRunawayException(const std::exception *e) {
     PrintExceptionContinue(e, "Runaway exception");
@@ -294,7 +294,7 @@
     }
 }
 
-BitcoinApplication::BitcoinApplication(interface::Node &node, int &argc,
+BitcoinApplication::BitcoinApplication(interfaces::Node &node, int &argc,
                                        char **argv)
     : QApplication(argc, argv), coreThread(0), m_node(node), optionsModel(0),
       clientModel(0), window(0), pollShutdownTimer(0),
@@ -581,7 +581,7 @@
 int main(int argc, char *argv[]) {
     SetupEnvironment();
 
-    std::unique_ptr<interface::Node> node = interface::MakeNode();
+    std::unique_ptr<interfaces::Node> node = interfaces::MakeNode();
 
     /// 1. Parse command-line options. These take precedence over anything else.
     // Command-line options take precedence:
@@ -750,7 +750,7 @@
     app.createOptionsModel(gArgs.GetBoolArg("-resetguisettings", false));
 
     // Subscribe to global signals from core
-    std::unique_ptr<interface::Handler> handler =
+    std::unique_ptr<interfaces::Handler> handler =
         node->handleInitMessage(InitMessage);
 
     // Get global config
diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -36,7 +36,7 @@
 class Config;
 class CWallet;
 
-namespace interface {
+namespace interfaces {
 class Handler;
 class Node;
 }
@@ -59,7 +59,7 @@
 public:
     static const std::string DEFAULT_UIPLATFORM;
 
-    explicit BitcoinGUI(interface::Node &node, const Config *,
+    explicit BitcoinGUI(interfaces::Node &node, const Config *,
                         const PlatformStyle *platformStyle,
                         const NetworkStyle *networkStyle, QWidget *parent = 0);
     ~BitcoinGUI();
@@ -91,9 +91,9 @@
     bool eventFilter(QObject *object, QEvent *event) override;
 
 private:
-    interface::Node &m_node;
-    std::unique_ptr<interface::Handler> m_handler_message_box;
-    std::unique_ptr<interface::Handler> m_handler_question;
+    interfaces::Node &m_node;
+    std::unique_ptr<interfaces::Handler> m_handler_message_box;
+    std::unique_ptr<interfaces::Handler> m_handler_question;
     ClientModel *clientModel = nullptr;
     WalletFrame *walletFrame = nullptr;
 
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -34,8 +34,8 @@
 
 #include "chainparams.h"
 #include "init.h"
-#include "interface/handler.h"
-#include "interface/node.h"
+#include "interfaces/handler.h"
+#include "interfaces/node.h"
 #include "ui_interface.h"
 #include "util.h"
 
@@ -72,7 +72,7 @@
 #endif
     ;
 
-BitcoinGUI::BitcoinGUI(interface::Node &node, const Config *configIn,
+BitcoinGUI::BitcoinGUI(interfaces::Node &node, const Config *configIn,
                        const PlatformStyle *_platformStyle,
                        const NetworkStyle *networkStyle, QWidget *parent)
     : QMainWindow(parent), enableWallet(false), m_node(node),
diff --git a/src/qt/optionsmodel.h b/src/qt/optionsmodel.h
--- a/src/qt/optionsmodel.h
+++ b/src/qt/optionsmodel.h
@@ -9,7 +9,7 @@
 
 #include <QAbstractListModel>
 
-namespace interface {
+namespace interfaces {
 class Node;
 }
 
@@ -30,7 +30,7 @@
     Q_OBJECT
 
 public:
-    explicit OptionsModel(interface::Node &node, QObject *parent = 0,
+    explicit OptionsModel(interfaces::Node &node, QObject *parent = 0,
                           bool resetSettings = false);
 
     enum OptionID {
@@ -85,7 +85,7 @@
     bool isRestartRequired() const;
 
 private:
-    interface::Node &m_node;
+    interfaces::Node &m_node;
     /* Qt-only settings */
     bool fHideTrayIcon;
     bool fMinimizeToTray;
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -12,7 +12,7 @@
 #include "guiutil.h"
 
 #include "amount.h"
-#include "interface/node.h"
+#include "interfaces/node.h"
 #include "intro.h"
 #include "net.h"
 #include "netbase.h"
@@ -25,7 +25,7 @@
 
 const char *DEFAULT_GUI_PROXY_HOST = "127.0.0.1";
 
-OptionsModel::OptionsModel(interface::Node &node, QObject *parent,
+OptionsModel::OptionsModel(interfaces::Node &node, QObject *parent,
                            bool resetSettings)
     : QAbstractListModel(parent), m_node(node) {
     Init(resetSettings);
diff --git a/src/qt/test/paymentservertests.cpp b/src/qt/test/paymentservertests.cpp
--- a/src/qt/test/paymentservertests.cpp
+++ b/src/qt/test/paymentservertests.cpp
@@ -8,7 +8,7 @@
 #include "paymentrequestdata.h"
 
 #include "amount.h"
-#include "interface/node.h"
+#include "interfaces/node.h"
 #include "random.h"
 #include "script/script.h"
 #include "script/standard.h"
@@ -65,7 +65,7 @@
 
 void PaymentServerTests::paymentServerTests() {
     SelectParams(CBaseChainParams::MAIN);
-    auto node = interface::MakeNode();
+    auto node = interfaces::MakeNode();
     OptionsModel optionsModel(*node);
     PaymentServer *server = new PaymentServer(nullptr, false);
     X509_STORE *caStore = X509_STORE_new();
diff --git a/src/qt/test/wallettests.cpp b/src/qt/test/wallettests.cpp
--- a/src/qt/test/wallettests.cpp
+++ b/src/qt/test/wallettests.cpp
@@ -3,7 +3,7 @@
 #include "chainparams.h"
 #include "config.h"
 #include "dstencode.h"
-#include "interface/node.h"
+#include "interfaces/node.h"
 #include "qt/bitcoinamountfield.h"
 #include "qt/optionsmodel.h"
 #include "qt/overviewpage.h"
@@ -140,7 +140,7 @@
     std::unique_ptr<const PlatformStyle> platformStyle(
         PlatformStyle::instantiate("other"));
     SendCoinsDialog sendCoinsDialog(platformStyle.get());
-    auto node = interface::MakeNode();
+    auto node = interfaces::MakeNode();
     OptionsModel optionsModel(*node);
     WalletModel walletModel(platformStyle.get(), &wallet, &optionsModel);
     sendCoinsDialog.setModel(&walletModel);