Colleen Mildred Hartland (born 1 February 1959) is a former Australian politician, and a Greens member of the Victorian Legislative Council from 2006 to 2018.

Hartland is a Western Suburbs resident and activist who rose to prominence as a leader of the community campaign against the storage of toxic chemicals at Coode Island during the 1990s.

She was a foundation member of the Hazardous Materials Action group (HAZMAG)[1] and was a member of Environment Effects Committees on West Point Wilson, Point Lillias and the proposed toxic dump at Werribee.

Hartland won a seat for the Victorian Greens in the Western Metropolitan Region of the Victorian Legislative Council in the 2006 State election, elected to the final spot, narrowly beating the Labor candidate after a vote recount.

[5] In the 2014 Victorian State Election, Hartland was re-elected, this time to the fourth position in the Western Metropolitan Region with 9.89% of first preference votes.