Katia Winter (born 13 October 1983) is a Swedish actress. She is best known for her roles as Nadia in the Showtime series Dexter (2012), Katrina Crane in the Fox series Sleepy Hollow (2013–15), Freydís Eiríksdóttir in The CW series Legends of Tomorrow (2017–18), and Gwen Karlsson in the CBS/Paramount+ series Blood & Treasure (2019–2023). She also appeared in the satirical superhero series The Boys on Amazon Prime Video as the Russian Mob boss Little Nina (2019–present).