Julianne Nicholson is an American actress. She is known for her roles in the film August: Osage County (2013) and the television series Law & Order: Criminal Intent (2006–2009), Masters of Sex (2013–2014), Eyewitness (2016), Mare of Easttown (2021), Paradise and Hacks, the latter three of which earned her nominations for Primetime Emmy Awards, winning two for Mare of Easttown and Hacks.