diff --git a/.github/workflows/code_checks.yml b/.github/workflows/code_checks.yml
new file mode 100644
index 0000000000..381f88eb1f
--- /dev/null
+++ b/.github/workflows/code_checks.yml
@@ -0,0 +1,45 @@
+# This workflow does some quick checks.
+name: Code Checks
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - '.github/workflows/code_checks.yml'
+      - 'docs/**'
+      - 'include/**'
+      - 'interface/**'
+      - 'misc/suppressions/**'
+      - '**/*.md'
+      - '!docs/changes*txt'
+  pull_request:
+    branches:
+      - master
+    paths:
+      - '.github/workflows/code_checks.yml'
+      - 'docs/**'
+      - 'include/**'
+      - 'interface/**'
+      - 'misc/suppressions/**'
+      - '**/*.md'
+      - '!docs/changes*txt'
+
+jobs:
+  check-unix:
+    runs-on: ubuntu-20.04
+    name: Check Spelling
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install codespell
+        run: |
+          pip3 install --no-warn-script-location codespell==1.17.1
+
+      - name: Run codespell
+        env:
+          CODESPELL: $HOME/.local/bin/codespell
+        run: |
+          ./misc/scripts/spellcheck
diff --git a/docs/index.htm b/docs/index.htm
index 5d1c28d77e..43a6fbc0c0 100644
--- a/docs/index.htm
+++ b/docs/index.htm
@@ -127,7 +127,7 @@
   <h1>Contributor Notes</h1>
 
   <p>Contributor notes contain information useful only to wxWidgets developers
-     for the maintainance of the project:</p>
+     for the maintenance of the project:</p>
 
   <ul>
     <li><a href="contributing/">Index of Contributor Notes</a></li>
diff --git a/docs/msw/install.md b/docs/msw/install.md
index eef51a59b7..31e94bd69e 100644
--- a/docs/msw/install.md
+++ b/docs/msw/install.md
@@ -301,7 +301,7 @@ debug mode, edit makefile.bcc and change /aa to /Tpe in link commands.
 Using the Debugger and IDE in BDS or Turbo Explorer
 ---------------------------------------------------
 
-Doubleclick / open \%WXWIN\%\samples\minimal\borland.bdsproj. The current version
+Double-click / open \%WXWIN\%\samples\minimal\borland.bdsproj. The current version
 is to be used with a dynamic build of wxWidgets-made by running
 make -f Makefile.bcc -DBUILD=debug -DSHARED=1
 in wxWidgets\build\msw. You also need the `wxWidgets\lib\bcc_dll`
diff --git a/docs/wine/install.txt b/docs/wine/install.txt
index e6e3d3311b..8563f41f1c 100644
--- a/docs/wine/install.txt
+++ b/docs/wine/install.txt
@@ -367,7 +367,7 @@ configure --disable-static --enable-shared --enable-gui \
  --with-libjpeg --enable-debug_cntxt
 
 Compiling a sample won't work yet because 'winebuild' needs
-to be called, and the resuling C file compiled and linked.
+to be called, and the resulting C file compiled and linked.
 Plus, Windows DLLs need to be imported.
 
 Note that the documentation on the WINE web site on using
diff --git a/misc/scripts/codespell.ignore b/misc/scripts/codespell.ignore
deleted file mode 100644
index 913a7b6c48..0000000000
--- a/misc/scripts/codespell.ignore
+++ /dev/null
@@ -1,6 +0,0 @@
-convertor
-malcom
-ot
-othere
-seh
-ser
diff --git a/misc/scripts/spellcheck b/misc/scripts/spellcheck
new file mode 100755
index 0000000000..ea6c69dddc
--- /dev/null
+++ b/misc/scripts/spellcheck
@@ -0,0 +1,32 @@
+#!/bin/sh
+CODESPELL=${CODESPELL-codespell}
+
+# Make sure we run codespell from the top wx directory.
+cd `dirname "$0"`/../..
+
+if ! command -v $CODESPELL > /dev/null; then
+    echo "ERROR: codespell not available." >&2
+    exit 127
+fi
+
+$CODESPELL \
+  -I misc/suppressions/codespell-words \
+  -x misc/suppressions/codespell-lines \
+  -S 'docs/changes.txt,docs/changes_30.txt,*.png,*.ico,*.bmp,*.cur,docs/doxygen/images' \
+  README.md docs include interface
+
+rc=$?
+
+if [ $rc != 0 ]; then
+    cat <<EOF
+
+=================================== ERROR ===================================
+Spell check failed, please correct the spelling mistakes at the locations
+listed above. If any of the reported mistakes are false positives, please add
+the lines provoking them to misc/suppressions/codespell-lines file or, if
+there are many occurrences of the same word, add this word to codespell-words
+file in the same directory.
+EOF
+>& 2
+    exit $rc
+fi
diff --git a/misc/suppressions/codespell-lines b/misc/suppressions/codespell-lines
new file mode 100644
index 0000000000..e80bff8717
--- /dev/null
+++ b/misc/suppressions/codespell-lines
@@ -0,0 +1,25 @@
+wxMessageBox(L"Salut \u00E0 toi!"); // U+00E0 is "Latin Small Letter a with Grave"
+wxMessageBox("Salut à toi!");
+wxMessageBox(wxString::FromUTF8("Salut \xC3\xA0 toi!"));
+<tt>(week|wee)(night|knights)</tt> matches all ten characters of "weeknights",
+expressions</em> (BRE). EREs are roughly those of the traditional @e egrep,
+@row2col{ <tt>b</tt> , Rest of RE is a BRE. }
+    the ARE <tt>(?:</tt> or the BRE <tt>\(</tt>.
+        return wxPrivate::wxAnyAsImpl<T>::DoAs(*this);
+    static T DoAs(const wxAny& any)
+    static wxString DoAs(const wxAny& any)
+        removeable,
+    virtual void HandleLineEvent( unsigned int n, bool doubleClick );
+        sequence of labels is A, B, ..., Z, AA, AB, ..., AZ, BA, ..., ..., ZZ,
+             wxEdge otherE,
+    void swap(wxScopedPtr<T>& ot);
+    SEH (structured exception handling) which currently means only Microsoft
+    void Set(wxRelationship rel, wxWindowBase *otherW, wxEdge otherE, int val = 0, int marg = wxLAYOUT_DEFAULT_MARGIN);
+// Copyright:   (c) 2009 Marcin Malich <me@malcom.pl>
+ * All of the settings below require SEH support (__try/__catch) and can't work
+  the version check in `include/wx/msw/seh.h` to suppress this warning for the
+#endif /* compiler doesn't support SEH */
+// Name:        wx/msw/seh.h
+// Purpose:     declarations for SEH (structured exceptions handling) support
+    // 2019), i.e. SEH translator seems to work just fine without /EHa too, so
+// Purpose:     helpers for the structured exception handling (SEH) under Win32
diff --git a/misc/suppressions/codespell-words b/misc/suppressions/codespell-words
new file mode 100644
index 0000000000..693a2774ec
--- /dev/null
+++ b/misc/suppressions/codespell-words
@@ -0,0 +1,3 @@
+convertor
+ot
+ser