Molly Shannon (born September 16, 1964) is an American actress and comedian. She was a cast member on the NBC sketch comedy series Saturday Night Live from 1995 to 2001. In 2017, she won the Film Independent Spirit Award for playing Joanne Mulcahey in the Chris Kelly autobiographical film Other People.

Shannon appeared in supporting roles in several films, including Happiness (1998), A Night at the Roxbury (1998), Never Been Kissed (1999), How the Grinch Stole Christmas (2000), Wet Hot American Summer (2001), Osmosis Jones (2001), My Boss's Daughter (2003), Talladega Nights: The Ballad of Ricky Bobby (2006), More of Me (2007), Evan Almighty (2007) and Me and Earl and the Dying Girl (2015). She appeared in the animated films Igor (2008) and Hotel Transylvania (2012). On television, Shannon had roles in Enlightened (2013), Divorce (2016–2019), The Other Two (2019-2022), The White Lotus (2021), I Love That for You (2022) and Only Murders in the Building (2024).