Heather Joan Graham (born January 29, 1970) is an American actress. After appearing in television commercials, her first starring role in a feature film came with the teen comedy License to Drive (1988), followed by the critically acclaimed film Drugstore Cowboy (1989), which gained her initial industry notice. She then played supporting roles in films such as Shout (1991), Diggstown (1992), Six Degrees of Separation (1993), Swingers (1996) and on the television series Twin Peaks (1991) and its prequel film Fire Walk with Me (1992), before gaining critical praise in Paul Thomas Anderson's Boogie Nights (1997) as porn starlet Brandy / Rollergirl. In 1999, she co-starred in Bowfinger and Austin Powers: The Spy Who Shagged Me.

In the 2000s, Graham starred in films Committed (2000), Say It Isn't So (2001), Mary (2005), Gray Matters (2007), The Hangover (2009) and its sequel, The Hangover Part III (2013). She also had a role on the television series Scrubs in 2004, before playing the title character on the short-lived series Emily's Reasons Why Not in 2006. She also had recurring roles on Showtime's Californication (2014) and Netflix's Flaked (2016).

Noted for portraying characters with sex appeal, she often appears in magazine lists of "Most Beautiful" and "Sexiest" women. Graham is a public advocate for Children International, and supported the climate change campaign Global Cool in 2007.