Abigail Leigh Spencer (born August 4, 1981) is an American actress known for roles in several television series. A Florida native, she began her career on the ABC daytime soap opera All My Children, where she played Rebecca Tyree from 1999 to 2001, and then starred in the short-lived Lifetime crime drama series Angela's Eyes (2006). Spencer has appeared in such films as In My Sleep (2010), Cowboys & Aliens (2011), This Means War (2012), Chasing Mavericks (2012), The Haunting in Connecticut 2: Ghosts of Georgia (2013), Oz the Great and Powerful (2013), and This Is Where I Leave You (2014).

On television, she had recurring roles in Mad Men, Hawthorne, and Suits. From 2013 to 2016, Spencer played Amantha Holden in the SundanceTV drama series Rectify, for which she was nominated for a Critics' Choice Television Award. In 2016, Spencer began playing the lead role of history professor Lucy Preston in the NBC series Timeless.