| Honorific-Prefix: | The Honourable |
| Mary Gillett | |
| Honorific-Suffix: | MP |
| Constituency Am1: | Tarneit |
| Assembly1: | Victorian Legislative |
| Term Start1: | 30 November 2002 |
| Term End1: | 25 November 2006 |
| Predecessor1: | New seat |
| Successor1: | Tim Pallas |
| Constituency Am2: | Werribee |
| Assembly2: | Victorian Legislative |
| Term Start2: | 30 March 1996 |
| Term End2: | 30 November 2002 |
| Predecessor2: | Ken Coghill |
| Successor2: | Seat abolished |
| Birth Date: | 1958 10, df=yes |
| Birth Place: | Sydney, New South Wales, Australia |
| Birthname: | Mary Jane Douglas |
| Children: | Three |
| Party: | Labor |
| Alma Mater: | Australian National University (BA) |
Mary Jane Gillett, née Douglas (born 9 October 1958) is a former Australian politician.
Born in Sydney, New South Wales, she graduated from Young High School in 1974 and received a Bachelor of Arts from the Australian National University in 1979. That year, she became a clerk in the Australian Taxation Office; in 1982 she became associate to Mr N. Taylor of the Australian Industrial Relations Commission, and in 1985 became National Industrial Officer with the Commonwealth Foremans' Association. In 1987 she became National Industrial Officer of the National Union of Workers.[1]
In 1996, Gillett was elected to the Victorian Legislative Assembly as the Labor member for Werribee. Her seat was abolished in 2002 and she transferred to Tarneit. During her tenure, she served multiple roles such as the Secretary for the Parliamentary Labor Party; Parliamentary Secretary for Volunteers; the 2006 Commonwealth Games, and Women's Affairs. In 2006 she was defeated for preselection by Tim Pallas, formerly chief of staff to Premier Steve Bracks, and Gillett retired from politics.[1]