diff --git a/README.md b/README.md
index 05855702e4..76888c033a 100644
--- a/README.md
+++ b/README.md
@@ -116,4 +116,7 @@ We thank the following organisations for their services used in Wagtail's develo
 [![License](https://img.shields.io/badge/license-BSD-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
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 [![Coverage](https://codecov.io/github/wagtail/wagtail/coverage.svg?branch=master)](https://codecov.io/github/wagtail/wagtail?branch=master)
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+[![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/wagtail/wagtail.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/wagtail/wagtail/context:python)
+[![Language grade: JavaScript](https://img.shields.io/lgtm/grade/javascript/g/wagtail/wagtail.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/wagtail/wagtail/context:javascript)
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