Jennifer Anne Garner (born April 17, 1972) is an American actress. Following a supporting role in Pearl Harbor (2001), Garner gained recognition for her performance as CIA officer Sydney Bristow in the ABC spy-action thriller Alias, which aired from 2001 to 2006. For her work on the series, she won a Golden Globe Award and a SAG Award, and received four Primetime Emmy Award nominations.

While working on Alias, Garner gained a cameo role in Catch Me if You Can (2002), followed by a praised leading performance in the romantic comedy film 13 Going on 30 (2004). Garner has appeared in supporting as well as lead film roles, including the superhero films Daredevil (2003) and Elektra (2005), the comedy-drama Juno (2007), and the fantasy comedy The Invention of Lying (2009). In the 2010s, she appeared in the romantic-comedy Valentine's Day (2010), the fantasy comedy-drama The Odd Life of Timothy Green (2012), the biographical drama Dallas Buyers Club (2013), the comedy film Alexander and the Terrible, Horrible, No Good, Very Bad Day (2014), the drama film Miracles from Heaven (2016), and the romantic comedy-drama film Love, Simon (2018).

Garner works frequently as an activist for early childhood education and is a board member of Save the Children. She is also an advocate for anti-paparazzi campaigns among children of celebrities. Garner had a five-year relationship with Scott Foley from 1998 to 2003, during which they married. Garner married actor Ben Affleck in 2005; they separated in 2015 and filed for divorce in 2017. Garner and Affleck have three children together.