Maria Karoliina Ohisalo (born 8 March 1985) is a Finnish politician.
She is a member of the Green League and has served as the party's leader since 2019.
In the 2019 parliamentary election she was elected with 11,797 votes.
She was named Minister of the Interior in the Rinne Cabinet and continued with her duties in the following Marin Cabinet.Ohisalo served as Green League's interim leader after Touko Aalto stepped down in September 2018.
She was the only candidate in the Green League leadership election which was held in June 2019.
She co-chaired by the Union of Green Youth and Students in 2013–2014 and has been a member of the Helsinki City Council since 2017 and an MP since 2019.