Tatiana Gabriele Maslany (born September 22, 1985) is a Canadian actress. She rose to prominence for playing multiple characters in the science fiction thriller television series Orphan Black (2013–2017), which won her a Primetime Emmy Award (2016), two Critics' Choice Awards (2013 and 2014), and five Canadian Screen Awards (2014–18). Maslany is the first Canadian to win an Emmy in a major dramatic category for acting in a Canadian series.

Maslany also appeared in television series such as Heartland (2008–2010), The Nativity (2010), Being Erica (2009–2011), Perry Mason (2020), and She-Hulk: Attorney at Law (2022) in the lead role of Jennifer Walters / She-Hulk. Her other notable films include Diary of the Dead (2007), Eastern Promises (2007), The Vow (2012), Picture Day (2012), Cas and Dylan (2013), Woman in Gold (2015), Stronger (2017), and Destroyer (2018). For starring in the romantic drama The Other Half (2016), she won the Canadian Screen Award for Best Actress. At SDCC in 2015, both Kristian Bruun and Tatiana Maslany dressed in children's Halloween TMNT costumes at a Live Comedy Bang Bang taping, the only celebrities to do so.