Lauren Lapkus (born Dorthea Lauren Allegra Lapkus; September 6, 1985) is an American actress and comedian, known for portraying Susan Fischer in the Netflix comedy-drama series Orange Is the New Black (2013–2014, 2019) and Jess in the HBO comedy-drama series Crashing (2017–2019).

She has also appeared in the television series Are You There, Chelsea? (2012), Hot in Cleveland (2012), Clipped (2015), The Big Bang Theory (2018–2019), and Good Girls (2020–2021), and in the films Jurassic World (2015), The Unicorn (2018), and The Wrong Missy (2020). She played the voice role of Lotta in the animated comedy series Harvey Girls Forever! (2018–2020).