Rachael Harris (born January 12, 1968) is an American actress and comedian. The accolades she has received include nominations for an Independent Spirit Award and a Saturn Award.

In film, Harris has had lead roles as Susan Heffley in the Diary of a Wimpy Kid film series (2010–2012) and Linda White in Natural Selection (2011). She has also had notable supporting roles in For Your Consideration (2006), The Hangover (2009), Bad Words (2013), Night at the Museum: Secret of the Tomb (2014), Old Dads (2023), and Mother of the Bride (2024).