Marin Mägi-Efert (née Marin Mägi; born 22 May 1982 in Kadrina) is an Estonian actress.

In 2004 she graduated from the performing arts department of the Estonian Academy of Music and Theatre in Tallinn under instruction of Ingo Normet. From 2005 until 2016, she worked at Rakvere Theatre. Since 2016, she has been a freelance actress. Besides theatrical roles she has also appeared in television roles and played in several films.

Marin Mägi is married to radio journalist and presenter Elvis Efert. The couple have two children, a boy born in 2010 and a girl born in 2018.