diff --git a/src/corelib/CMakeLists.txt b/src/corelib/CMakeLists.txt
index 68745591d2c..ecb0b8e2f3e 100644
--- a/src/corelib/CMakeLists.txt
+++ b/src/corelib/CMakeLists.txt
@@ -561,6 +561,11 @@ qt_internal_extend_target(Core CONDITION QT_FEATURE_thread AND WIN32
         synchronization
 )
 
+qt_internal_extend_target(Core CONDITION CYGWIN
+    SOURCES
+        global/qt_windows.h
+)
+
 qt_internal_extend_target(Core CONDITION WIN32
     SOURCES
         global/qoperatingsystemversion_win.cpp global/qoperatingsystemversion_win_p.h
@@ -1187,6 +1192,10 @@ qt_internal_extend_target(Core CONDITION QT_FEATURE_library
     SOURCES
         plugin/qlibrary.cpp plugin/qlibrary.h plugin/qlibrary_p.h
 )
+qt_internal_extend_target(Core CONDITION QT_FEATURE_library AND CYGWIN
+    SOURCES
+        plugin/qcoffpeparser.cpp plugin/qcoffpeparser_p.h
+)
 qt_internal_extend_target(Core CONDITION QT_FEATURE_library AND WIN32
     SOURCES
         plugin/qcoffpeparser.cpp plugin/qcoffpeparser_p.h
diff --git a/src/corelib/plugin/qcoffpeparser.cpp b/src/corelib/plugin/qcoffpeparser.cpp
index 64c29035840..8fef53a41a5 100644
--- a/src/corelib/plugin/qcoffpeparser.cpp
+++ b/src/corelib/plugin/qcoffpeparser.cpp
@@ -9,6 +9,9 @@
 
 #include <optional>
 
+// Include minimal set of headers
+#define WIN32_LEAN_AND_MEAN
+#define NOGDI
 #include <qt_windows.h>
 
 QT_BEGIN_NAMESPACE
diff --git a/src/corelib/plugin/qcoffpeparser_p.h b/src/corelib/plugin/qcoffpeparser_p.h
index 19c650fee06..4a28827a5ef 100644
--- a/src/corelib/plugin/qcoffpeparser_p.h
+++ b/src/corelib/plugin/qcoffpeparser_p.h
@@ -18,7 +18,7 @@
 
 #include "qlibrary_p.h"
 
-#if defined(Q_OS_WIN)
+#if defined(Q_OS_WIN) || defined(Q_OS_CYGWIN)
 
 QT_BEGIN_NAMESPACE
 
@@ -29,6 +29,6 @@ struct QCoffPeParser
 
 QT_END_NAMESPACE
 
-#endif // defined(Q_OF_ELF) && defined(Q_CC_GNU)
+#endif // Q_OS_WIN || Q_OS_CYGWIN
 
 #endif // QCOFFPEPARSER_H
diff --git a/src/corelib/plugin/qfactoryloader.cpp b/src/corelib/plugin/qfactoryloader.cpp
index 1c6ebdaea39..daf68c5d18a 100644
--- a/src/corelib/plugin/qfactoryloader.cpp
+++ b/src/corelib/plugin/qfactoryloader.cpp
@@ -304,7 +304,7 @@ inline void QFactoryLoaderPrivate::updateSinglePath(const QString &path)
     qCDebug(lcFactoryLoader) << "checking directory path" << path << "...";
 
     QDirListing plugins(path,
-#if defined(Q_OS_WIN)
+#if defined(Q_OS_WIN) || defined(Q_OS_CYGWIN)
                 QStringList(QStringLiteral("*.dll")),
 #elif defined(Q_OS_ANDROID)
                 QStringList("libplugins_%1_*.so"_L1.arg(suffix)),
diff --git a/src/corelib/plugin/qlibrary.cpp b/src/corelib/plugin/qlibrary.cpp
index cc935251421..854d375c72f 100644
--- a/src/corelib/plugin/qlibrary.cpp
+++ b/src/corelib/plugin/qlibrary.cpp
@@ -177,7 +177,7 @@ static QLibraryScanResult qt_find_pattern(const char *s, qsizetype s_len, QStrin
     return QElfParser::parse({s, s_len}, errMsg);
 #elif defined(Q_OF_MACH_O)
     return QMachOParser::parse(s, s_len, errMsg);
-#elif defined(Q_OS_WIN)
+#elif defined(Q_OS_WIN) || defined(Q_OS_CYGWIN)
     return QCoffPeParser::parse({s, s_len}, errMsg);
 #else
 #   warning "Qt does not know how to efficiently parse your platform's binary format; using slow fall-back."
@@ -615,7 +615,7 @@ QtPluginInstanceFunction QLibraryPrivate::loadPlugin()
  */
 bool QLibrary::isLibrary(const QString &fileName)
 {
-#if defined(Q_OS_WIN)
+#if defined(Q_OS_WIN) || defined(Q_OS_CYGWIN)
     return fileName.endsWith(".dll"_L1, Qt::CaseInsensitive);
 #else // Generic Unix
 # if defined(Q_OS_DARWIN)
diff --git a/src/corelib/plugin/qlibrary_p.h b/src/corelib/plugin/qlibrary_p.h
index ebc7c91d26e..f582e20ffed 100644
--- a/src/corelib/plugin/qlibrary_p.h
+++ b/src/corelib/plugin/qlibrary_p.h
@@ -83,6 +83,8 @@ public:
     {
 #ifdef Q_OS_WIN
         return {};
+#elif defined(Q_OS_CYGWIN)
+        return u"cyg";
 #else
         return u"lib";
 #endif
diff --git a/src/corelib/plugin/qlibrary_unix.cpp b/src/corelib/plugin/qlibrary_unix.cpp
index d05a5fa0ac8..e629e2b1f12 100644
--- a/src/corelib/plugin/qlibrary_unix.cpp
+++ b/src/corelib/plugin/qlibrary_unix.cpp
@@ -53,6 +53,12 @@ QStringList QLibraryPrivate::suffixes_sys(const QString &fullVersion)
     } else {
         suffixes << ".sl"_L1;
     }
+#elif defined(Q_OS_CYGWIN)
+    if (!fullVersion.isEmpty()) {
+        suffixes << "-%1.dll"_L1.arg(fullVersion);
+    } else {
+        suffixes << QStringLiteral(".dll");
+    }
 #elif defined(Q_OS_AIX)
     suffixes << ".a";