Gregory John Barber (born 31 August 1966) is a former Australian politician, who was a Greens member of the Victorian Legislative Council between 2006 and 2017.

During his time as Mayor, Barber and his Greens colleagues accomplished an increase in spending on bicycle paths and conducted soil contamination surveys of playgrounds and child care centres.

He also organised the planting of street trees, worked on disability discrimination issues, and spoke out against exploitation in the sex industry.

[2] Barber won a seat for the Greens in the Northern Metropolitan Region of the Victorian Legislative Council in the 2006 State election.

[8] On 13 June 2017, it was announced in an email to party members that Barber, and Colleen Hartland, would not be seeking reelection at the 2018 Victorian state election.