diff --git a/.appveyor.yml b/.appveyor.yml
index 3d0b49f1bc..626eeb3c4d 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -46,7 +46,6 @@ environment:
   - TOOLCHAIN: 14.0
   - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
     TOOLCHAIN: 2017
-  - TOOLCHAIN: cygwin
   - TOOLCHAIN: mingw
     APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
 
@@ -61,12 +60,6 @@ matrix:
   # VS Express installs don't have the 64 bit compiler
   - platform: x64
     TOOLCHAIN: 10.0
-  # Cygwin static-debug has compiler problems
-  - configuration: static-debug
-    TOOLCHAIN: cygwin
-  # Cygwin x86 install is currently (08/2019) broken (libncursesw-devel fails)
-  - platform: x86
-    TOOLCHAIN: cygwin
 
 
 #---------------------------------#
diff --git a/.ci/appveyor-make.bat b/.ci/appveyor-make.bat
index 9cd8fe6841..8d976d93d2 100644
--- a/.ci/appveyor-make.bat
+++ b/.ci/appveyor-make.bat
@@ -1,6 +1,6 @@
 :: Universal build script for AppVeyor (https://ci.appveyor.com/)
 :: Environment:
-::     TOOLCHAIN      -  toolchain version   [10.0/11.0/12.0/14.0/2017/cygwin/mingw]
+::     TOOLCHAIN      -  toolchain version   [10.0/11.0/12.0/14.0/2017/mingw]
 ::     CONFIGURATION  -  determines EPICS build   [dynamic/static]
 ::     PLATFORM       -  architecture   [x86/x64]
 ::
@@ -20,24 +20,6 @@ echo [INFO] Platform: %OS%
 set "MAKEARGS=-j2 -Otarget"
 if "%APPVEYOR_REPO_BRANCH%"=="3.14" set MAKEARGS=
 
-if "%TOOLCHAIN%"=="cygwin" (
-    set "MAKE=make"
-    if "%OS%"=="64BIT" (
-        set "EPICS_HOST_ARCH=cygwin-x86_64"
-        set "INCLUDE=C:\cygwin64\include;%INCLUDE%"
-        set "PATH=C:\cygwin64\bin;%PATH%"
-        echo [INFO] Cygwin Toolchain 64bit
-    ) else (
-        set "EPICS_HOST_ARCH=cygwin-x86"
-        set "INCLUDE=C:\cygwin\include;%INCLUDE%"
-        set "PATH=C:\cygwin\bin;%PATH%"
-        echo [INFO] Cygwin Toolchain 32bit
-    )
-    echo [INFO] Compiler Version
-    gcc -v
-    goto Finish
-)
-
 if "%TOOLCHAIN%"=="mingw" (
     set "MAKE=mingw32-make"
     if "%OS%"=="64BIT" (
diff --git a/.ci/appveyor-prepare.bat b/.ci/appveyor-prepare.bat
index 9f105ee96b..a685dbfb3d 100644
--- a/.ci/appveyor-prepare.bat
+++ b/.ci/appveyor-prepare.bat
@@ -1,12 +1,12 @@
 :: Build script for AppVeyor (https://ci.appveyor.com/)
 :: Environment:
-::     TOOLCHAIN      -  Toolchain Version  [9.0/10.0/11.0/12.0/14.0/cygwin/mingw]
+::     TOOLCHAIN      -  Toolchain Version  [9.0/10.0/11.0/12.0/14.0/mingw]
 ::     CONFIGURATION  -  determines EPICS build  [dynamic/static, -debug]
 ::     PLATFORM       -  "x86" -> use 32bit architecture
 ::
 :: Prepares an Appveyor build by excuting the following steps
 ::     - Set up configure\CONFIG_SITE for static vs. dynamic build
-::     - Install Cygwin / Mingw  (TOOLCHAIN setting) in the in the appropriate flavor
+::     - Install Mingw  (TOOLCHAIN setting) in the in the appropriate flavor
 ::     - Download and install Make-4.1 from EPICS download page
 
 Setlocal EnableDelayedExpansion
@@ -16,31 +16,6 @@ if "%PLATFORM%"=="x86" set OS=32BIT
 
 echo [INFO] Platform: %OS%
 
-if "%TOOLCHAIN%"=="cygwin" (
-    echo.%CONFIGURATION% | findstr /C:"static">nul && (
-        echo SHARED_LIBRARIES=NO>> configure\CONFIG_SITE
-        echo STATIC_BUILD=YES>> configure\CONFIG_SITE
-        echo [INFO] EPICS set up for static build
-    ) || (
-        echo [INFO] EPICS set up for dynamic build
-    )
-    echo.%CONFIGURATION% | findstr /C:"debug">nul && (
-        echo HOST_OPT=NO>> configure\CONFIG_SITE
-        echo [INFO] EPICS set up for debug build
-    ) || (
-        echo [INFO] EPICS set up for optimized build
-    )
-    if "%OS%"=="64BIT" (
-        echo [INFO] Installing Cygwin 64bit and dependencies
-        @powershell -Command "(new-object net.webclient).DownloadFile('http://www.cygwin.com/setup-x86_64.exe', 'C:\cygwin64\setup-x86_64.exe')"
-        C:\cygwin64\setup-x86_64.exe -q -P "libreadline-devel,libncursesw-devel"
-    ) else (
-        echo [INFO] Installing Cygwin 32bit and dependencies
-        @powershell -Command "(new-object net.webclient).DownloadFile('http://www.cygwin.com/setup-x86.exe', 'C:\cygwin\setup-x86.exe')"
-        C:\cygwin\setup-x86.exe -q -P "libreadline-devel,libncursesw-devel"
-    )
-)
-
 if "%TOOLCHAIN%"=="mingw" (
     echo.%CONFIGURATION% | findstr /C:"static">nul && (
         echo SHARED_LIBRARIES=NO>> configure\CONFIG_SITE