Penn Dayton Badgley (born November 1, 1986) is an American actor and musician. He is known for his roles as Dan Humphrey in The CW teen drama series Gossip Girl (2007–2012) and as Joe Goldberg in the Netflix thriller series You (2018–present). For Gossip Girl, he received six Teen Choice Award nominations, and for You, he earned MTV Movie & TV Award and Saturn Award nominations.

Badgley first became known for portraying Phillip Chancellor IV on the soap opera The Young and the Restless (2000–2001), which earned him a Young Artist Award nomination, and he followed this with roles in the comedy films John Tucker Must Die (2006) and Drive-Thru (2007). Badgley went on to appear in a number of films, such as the thriller The Stepfather (2009), the teen comedy-drama Easy A (2010), the financial thriller Margin Call (2011), the biographical film Greetings from Tim Buckley (2012) and the independent drama The Paper Store (2016). For Margin Call, he won an Independent Spirit Award.

Aside from acting, Badgley has worked in music; he was the lead singer for Brooklyn-based indie band MOTHXR, whose debut studio album, Centerfold, was released in 2016. In 2017 he married singer Domino Kirke, with whom he has one child.