is an American actress. Following her film debut in Wiener-Dog (2016), Baryshnikov had supporting roles in films such as Manchester by the Sea (2016), The Kindergarten Teacher (2018), and Love Lies Bleeding (2024). She is best known for her lead roles as Maya on the first season of the CBS sitcom series Superior Donuts (2017) and Lavinia Norcross Dickinson on the Apple TV+ comedy drama series Dickinson (2019–21). 
Baryshnikov began acting at age 6 in a children's theater production of A Midsummer Night's Dream, portraying Peaseblossom, a handmaiden to fairy queen Titania. After graduating from Northwestern University in 2014, she began acting professionally on various television series, including Doll & Em on HBO.

Baryshnikov's most prominent role to date was in the 2016 critically acclaimed drama Manchester by the Sea, alongside Casey Affleck and Michelle Williams. Her character, Sandy, is a girlfriend of Patrick Chandler, portrayed by Lucas Hedges. She practiced her character's Boston accent by working with a dialect coach and going to Boston-area malls to hear how local teenage girls spoke.

Baryshnikov starred as grad student Maya in the CBS series Superior Donuts, based on the play of the same name by Tracy Letts. The series, which debuted in February 2017, was renewed for a second season by CBS, but Baryshnikov's character does not appear in the second season. In 2017, she appeared in the Broadway production of the play Time and the Conways. In 2018, she appeared in the film The Kindergarten Teacher.

On September 26, 2018, Baryshnikov was cast in the role of Lavinia Norcross Dickinson in the Apple TV+ series Dickinson, alongside Hailee Steinfeld.