Aaron Himelstein (born October 10, 1985) is an American actor. He is perhaps best known for playing a younger version of Austin Powers in Austin Powers in Goldmember (2002) and Friedman in Joan of Arcadia (2003 - 2005). Other film appearances include High Fidelity (2000), Fast Food Nation (2006), Captain America: The Winter Soldier (2014), Avengers: Age of Ultron (2015), and Blink Twice (2024). Himelstein has made guest appearances in numerous television series such as Cupid, Boston Public, North Shore, House, and Community. He also had a recurring voice role on The Legend of Korra (2013 - 2014) as Desna, the androgynous waterbending twin of Aubrey Plaza's character.

2009