LisaGay Hamilton (born March 25, 1964) is an American actress who has portrayed roles in films, television, and on stage. She is best known for her role as secretary/lawyer Rebecca Washington on the legal drama The Practice (1997–2003). She also portrayed Melissa Thoreau on the TNT comedy-drama Men of a Certain Age (2009–2011), Celia Jones on the Netflix series House of Cards (2016), Suzanne Simms on the Hulu series Chance (2016), and Kayla Price in The First (2018), also by Hulu.

Hamilton's film credits include roles in 12 Monkeys (1995), Jackie Brown (1997), Beloved (1998), True Crime (1999), The Sum of All Fears (2002), The Soloist (2009), Beastly (2011), Beautiful Boy (2018), and Vice (2018). Her theater credits include Measure for Measure (Isabella), Henry IV Parts I & II (Lady Hotspur), Athol Fugard's, Valley Song and The Ohio State Murders. Hamilton was also an original cast member in the Broadway productions of August Wilson's The Piano Lesson and Gem of the Ocean. In 2005 she won a Peabody Award for creating and directing the 2003 documentary film Beah: A Black Woman Speaks.