Allison Howell Williams (born April 13, 1988 in New Canaan, Connecticut) is an American actress, comedian, and singer.
Williams is perhaps best known for playing Marnie Michaels on the HBO series Girls, as well as Peter Pan in NBC's 2014 production of Peter Pan Live!. She also appeared in the 2017 horror film Get Out (2017) opposite Daniel Kaluuya.
Her father, Brian Williams, is a noted journalist and anchorman.
- American Dreams (2004) as Deborah
- Girls (2012 — 2017) as Marnie Michaels
- The Mindy Project (2013) as Jillian
- Peter Pan Live! (2014) as Peter Pan
- Get Out (2017) (2017) as Rose Armitage
- A Series of Unfortunate Events (2018) as Kit Snicket
- The Perfection (2018) as Charlotte
- M3GAN (2023)