diff --git a/CHANGES.rst b/CHANGES.rst
index e2eba10..bbea07a 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -12,6 +12,8 @@ Unreleased
     URLs when the page is hosted so that it loads the CSS. :issue:`34`
 -   Remove handling for ``singlehtml_sidebars`` config which predated Sphinx's
     support. :pr:`119`
+-   Remove "babel" and "platter" theme variants which were undocumented and did
+    not appear to be used by the relevant projects. :pr:`120`
 
 
 Version 2.1.3
diff --git a/src/pallets_sphinx_themes/themes/babel/static/babel.css b/src/pallets_sphinx_themes/themes/babel/static/babel.css
deleted file mode 100644
index c7ef82a..0000000
--- a/src/pallets_sphinx_themes/themes/babel/static/babel.css
+++ /dev/null
@@ -1,24 +0,0 @@
-@import url(pocoo.css);
-@import url(http://fonts.googleapis.com/css?family=Bree+Serif);
-
-body {
-  font-family: "Verdana", "Garamond", "Georgia", serif;
-}
-
-h1, h2, h3, h4, h5, h6, p.admonition-title, div.sphinxsidebar input {
-  font-family: "Bree Serif", "Garamond", "Georgia", serif;
-}
-
-a {
-  color: #b00;
-  text-decoration-color: #b00;
-}
-
-a:hover {
-  color: #fc5e1e;
-  text-decoration-color: #fc5e1e;
-}
-
-p.version-warning {
-  background-color: #d40;
-}
diff --git a/src/pallets_sphinx_themes/themes/babel/theme.conf b/src/pallets_sphinx_themes/themes/babel/theme.conf
deleted file mode 100644
index b62dedd..0000000
--- a/src/pallets_sphinx_themes/themes/babel/theme.conf
+++ /dev/null
@@ -1,3 +0,0 @@
-[theme]
-inherit = pocoo
-stylesheet = babel.css
diff --git a/src/pallets_sphinx_themes/themes/platter/static/platter.css b/src/pallets_sphinx_themes/themes/platter/static/platter.css
deleted file mode 100644
index 1a5a0c6..0000000
--- a/src/pallets_sphinx_themes/themes/platter/static/platter.css
+++ /dev/null
@@ -1,26 +0,0 @@
-@import url(pocoo.css);
-@import url(https://fonts.googleapis.com/css?family=Fira+Mono:400,700|Bitter:400,400italic,700);
-
-body {
-  font-family: "Bitter", "Garamond", "Georgia", serif;
-}
-
-pre, code {
-  font-family: "Fira Mono", "Consolas", "Menlo", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", monospace;
-}
-
-div.body {
-  color: #163228;
-}
-
-a {
-  color: #bca612;
-}
-
-a:hover {
-  color: #95840e;
-}
-
-p.version-warning {
-  background-color: #e39046;
-}
diff --git a/src/pallets_sphinx_themes/themes/platter/theme.conf b/src/pallets_sphinx_themes/themes/platter/theme.conf
deleted file mode 100644
index 68dd806..0000000
--- a/src/pallets_sphinx_themes/themes/platter/theme.conf
+++ /dev/null
@@ -1,3 +0,0 @@
-[theme]
-inherit = pocoo
-stylesheet = platter.css