Rachael MacFarlane is an American voice actress best known for her roles on the animated series The Grim Adventures of Billy & Mandy, Family Guy and American Dad!.
She has also voiced roles in Johnny Bravo, The Powerpuff Girls and What's New, Scooby-Doo?, among others.
Aside from voice acting, MacFarlane has also been involved in other aspects of animation, such as being a production manager for Billy and Mandy and Welcome to Eltingville. She also wrote an episode of Billy and Mandy, titled "Educating Grim".
She is the sister of Seth MacFarlane, the creator of Family Guy and American Dad!.