Marsha Rose Thomson (born 21 December 1955) is an Australian politician.

She was a member of the Victorian Legislative Assembly, representing the electoral district of Footscray for the Labor Party from 2006 to 2018; she previously served in the Victorian Legislative Council from 1999 to 2006.

[1] Thomson was an economic research officer, ministerial adviser, Implementation Manager with V/Line and Executive Officer of Youth Policy Development Council before being elected to the Legislative Council for Melbourne North Province in September 1999.

Due to the Upper House reforms, her former electorate of Melbourne North Province was abolished.

As a result of Bruce Mildenhall's retirement from politics, Thomson ran for and won his electorate of Footscray at the 2006 State Election.