diff --git a/images/images.qrc b/images/images.qrc
index 13c0e6edff2..3786c58088c 100644
--- a/images/images.qrc
+++ b/images/images.qrc
@@ -365,6 +365,8 @@
         <file>themes/default/mIconColorWheel.svg</file>
         <file>themes/default/mIconConnect.png</file>
         <file>themes/default/mIconClose.svg</file>
+        <file>themes/default/mIconCloseTab.svg</file>
+        <file>themes/default/mIconCloseTabHover.svg</file>
         <file>themes/default/mIconCritical.png</file>
         <file>themes/default/mIconDataDefine.svg</file>
         <file>themes/default/mIconDataDefineError.svg</file>
diff --git a/images/themes/default/mIconCloseTab.svg b/images/themes/default/mIconCloseTab.svg
new file mode 100644
index 00000000000..81e041dcae1
--- /dev/null
+++ b/images/themes/default/mIconCloseTab.svg
@@ -0,0 +1,5 @@
+<svg enable-background="new 0 0 32 32" height="32" viewBox="0 0 32 32" width="32" xmlns="http://www.w3.org/2000/svg">
+<rect x="0" y="0" width="32" height="32" style="fill:#fff;fill-opacity:0;"/>
+<path d="M16,1.778c-7.436,0 -13.463,6.028 -13.463,13.463c0,7.435 6.027,13.463 13.463,13.463c7.434,0 13.463,-6.028 13.463,-13.463c0,-7.435 -6.029,-13.463 -13.463,-13.463Zm6.965,17.89c0.701,0.701 0.701,1.837 0,2.538c-0.351,0.351 -0.81,0.526 -1.269,0.526c-0.46,0 -0.918,-0.175 -1.269,-0.526l-4.427,-4.427l-4.426,4.427c-0.35,0.351 -0.809,0.526 -1.269,0.526c-0.46,0 -0.919,-0.176 -1.269,-0.526c-0.701,-0.701 -0.701,-1.837 0,-2.538l4.426,-4.427l-4.426,-4.426c-0.701,-0.701 -0.701,-1.837 0,-2.538c0.7,-0.701 1.838,-0.701 2.538,0l4.426,4.426l4.427,-4.426c0.701,-0.701 1.837,-0.701 2.538,0c0.701,0.701 0.701,1.837 0,2.538l-4.427,4.426l4.427,4.427Z" opacity=".65"/>
+<path d="M18.538,15.24l4.427,-4.425c0.701,-0.701 0.701,-1.838 0,-2.539c-0.701,-0.701 -1.837,-0.701 -2.538,0l-4.427,4.426l-4.426,-4.426c-0.7,-0.701 -1.838,-0.701 -2.538,0c-0.701,0.701 -0.701,1.838 0,2.539l4.426,4.425l-4.426,4.427c-0.701,0.701 -0.701,1.838 0,2.539c0.35,0.35 0.809,0.526 1.269,0.526c0.46,0 0.919,-0.176 1.269,-0.526l4.426,-4.427l4.427,4.427c0.351,0.35 0.809,0.526 1.269,0.526c0.459,0 0.918,-0.176 1.269,-0.526c0.701,-0.701 0.701,-1.838 0,-2.539l-4.427,-4.427Z" fill="#A0A0A0" opacity=".9"/>
+</svg>
diff --git a/images/themes/default/mIconCloseTabHover.svg b/images/themes/default/mIconCloseTabHover.svg
new file mode 100644
index 00000000000..11994ec3815
--- /dev/null
+++ b/images/themes/default/mIconCloseTabHover.svg
@@ -0,0 +1,5 @@
+<svg enable-background="new 0 0 32 32" height="32" viewBox="0 0 32 32" width="32" xmlns="http://www.w3.org/2000/svg">
+<rect x="0" y="0" width="32" height="32" style="fill:#fff;fill-opacity:0;"/>
+<path d="M16,1.778c-7.436,0 -13.463,6.028 -13.463,13.463c0,7.435 6.027,13.463 13.463,13.463c7.434,0 13.463,-6.028 13.463,-13.463c0,-7.435 -6.029,-13.463 -13.463,-13.463Zm6.965,17.89c0.701,0.701 0.701,1.837 0,2.538c-0.351,0.351 -0.81,0.526 -1.269,0.526c-0.46,0 -0.918,-0.175 -1.269,-0.526l-4.427,-4.427l-4.426,4.427c-0.35,0.351 -0.809,0.526 -1.269,0.526c-0.46,0 -0.919,-0.176 -1.269,-0.526c-0.701,-0.701 -0.701,-1.837 0,-2.538l4.426,-4.427l-4.426,-4.426c-0.701,-0.701 -0.701,-1.837 0,-2.538c0.7,-0.701 1.838,-0.701 2.538,0l4.426,4.426l4.427,-4.426c0.701,-0.701 1.837,-0.701 2.538,0c0.701,0.701 0.701,1.837 0,2.538l-4.427,4.426l4.427,4.427Z" opacity=".50"/>
+<path d="M18.538,15.24l4.427,-4.425c0.701,-0.701 0.701,-1.838 0,-2.539c-0.701,-0.701 -1.837,-0.701 -2.538,0l-4.427,4.426l-4.426,-4.426c-0.7,-0.701 -1.838,-0.701 -2.538,0c-0.701,0.701 -0.701,1.838 0,2.539l4.426,4.425l-4.426,4.427c-0.701,0.701 -0.701,1.838 0,2.539c0.35,0.35 0.809,0.526 1.269,0.526c0.46,0 0.919,-0.176 1.269,-0.526l4.426,-4.427l4.427,4.427c0.351,0.35 0.809,0.526 1.269,0.526c0.459,0 0.918,-0.176 1.269,-0.526c0.701,-0.701 0.701,-1.838 0,-2.539l-4.427,-4.427Z" fill="#A0A0A0" opacity=".9"/>
+</svg>
diff --git a/src/app/qgisappstylesheet.cpp b/src/app/qgisappstylesheet.cpp
index 710a3684915..937e9c446fe 100644
--- a/src/app/qgisappstylesheet.cpp
+++ b/src/app/qgisappstylesheet.cpp
@@ -104,6 +104,21 @@ void QgisAppStyleSheet::buildStyleSheet( const QMap<QString, QVariant> &opts )
 
   ss += QStringLiteral( "* { font: %1pt \"%2\"} " ).arg( fontSize, fontFamily );
 
+#if QT_VERSION >= 0x050900
+  // Fix for macOS Qt 5.9+, where close boxes do not show on document mode tab bar tabs
+  // See: https://bugreports.qt.io/browse/QTBUG-61092
+  //      https://bugreports.qt.io/browse/QTBUG-61742
+  // Setting any stylesheet makes the default close button disappear.
+  // Specifically setting a custom close button temporarily works around issue.
+  // TODO: Remove when regression is fixed (Qt 5.9.3 or 5.10?); though hard to tell,
+  //       since we are overriding the default close button image now.
+  if ( mMacStyle )
+  {
+    ss += QLatin1String( "QTabBar::close-button{ image: url(:/images/themes/default/mIconCloseTab.svg); }" );
+    ss += QLatin1String( "QTabBar::close-button:hover{ image: url(:/images/themes/default/mIconCloseTabHover.svg); }" );
+  }
+#endif
+
   // QGroupBox and QgsCollapsibleGroupBox, mostly for Ubuntu and Mac
   bool gbxCustom = opts.value( QStringLiteral( "groupBoxCustom" ) ).toBool();
   QgsDebugMsg( QString( "groupBoxCustom: %1" ).arg( gbxCustom ) );