Peyton List (born August 8, 1986) is an American actress and professional model, known for roles on Mad Men, FlashForward, The Tomorrow People and Frequency. She began her career on daytime television, playing Lucy Montgomery on the CBS soap opera As the World Turns from 2001 to 2005, before she went to primetime with regular roles on the short-lived dramas Windfall (2006) and Big Shots (2007).
From 2008 to 2013, List had a recurring role as Jane Siegel in the AMC period drama Mad Men. In film, she has appeared in The Greatest Game Ever Played (2005), Shuttle (2009) and Meeting Evil (2012). List also starred in the short-lived science fiction dramas FlashForward (ABC, 2009–2010), and The Tomorrow People (The CW, 2013–2014). During the 2016–17 television season, she starred as the lead character in The CW drama series Frequency. In 2018, she had a recurring role in season 3 of the science fiction series Colony. She also starred on a recurring basis as Ivy Pepper/Poison Ivy in the Fox crime drama series Gotham (2018–2019).