Mai Treial (born 22 May 1952) is an Estonian politician who served as a Riigikogu member from 1995 until 2011.
A 1987 graduate of University of Tartu, she served in several government positions in Jõgeva County, including Secretary of State, and was a member of Jõgeva City Council from 1993 to 2005.
Treial is a Commander of the Order of Merit of the Republic of Italy (2005) and a Fourth Class recipient Order of the White Star (2002). She has a son and a daughter.
On 8 January 2013, Treial was elected as Chairman of Jõgeva City Council.