Mari Must (11 November 1920 Tartu – 20 February 2008[1]) was an Estonian linguist.
She was one of the most notable Estonian dialects researcher in Estonia.
1947-1992 she worked at Estonian SSR Academy of Sciences' Language and Literature Institute.
[2] In 1957 she established the sound archive of Estonian language.
She was the chief editor of the series Eesti murded.