Penn Dayton Badgley (born November 1, 1986) is an American actor. He is primarily known for his roles as Dan Humphrey in The CW teen drama series Gossip Girl (2007–2012) and 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.