Marianne Cerilli is a politician in Manitoba, Canada. She served as a New Democratic member of the Manitoba legislature from 1990 until 2003, though she was not called to cabinet when the party formed government in 1999.

Cerilli is the daughter of railway trade unionist Al Cerilli. She was raised in Winnipeg, Manitoba, and was educated at the University of Manitoba (from which she holds a B.P.E. and a Bachelor of Education degree). Before entering political life, she worked as a high school athletics coach, and was a counsellor in the Winnipeg School Division. She also worked at the Unemployed Health Centre of Winnipeg, and was a consultant to Manitoba Employment and Youth Services for three years.

Cerilli initially intended to run for the NDP in the north-end Winnipeg riding of Broadway in the 1990 provincial election, but lost the party nomination to Conrad Santos by one vote. She instead ran in the northeast Winnipeg riding of Radisson, where she defeated Progressive Conservative candidate Mike Thompson by almost 1500 votes (incumbent Liberal Allan Patterson finished third). The Progressive Conservatives won the general election, and Cerilli joined nineteen other New Democrats in the official opposition.

Cerilli was re-elected in the 1995 provincial election, defeating Liberal Art Miki by 4891 votes to 2401. The Progressive Conservatives won the general election again; during her time in opposition, Cerilli served as NDP critic for Housing, Workplace Safety, Health and Youth.

The NDP were victorious in the 1999 provincial election, and Barrett personally defeated Progressive Conservative Henry McDonald by 5198 votes to 3114. She was not appointed to cabinet, but served as legislative assistant to the Minister of Family Services and Housing. In 2003, she supported Bill Blaikie's campaign to lead the federal New Democratic Party.

Cerilli did not run for re-election in the 2003 election. She now teaches part-time at the University of Winnipeg, and is operating a community development business.