Janice Rhea Reimer (born May 23, 1952) is a Canadian politician and the first female mayor of Edmonton, Alberta, having served in that capacity from 1989 until 1995. Highlights of her time in office included the inception of a new waste management system (which included curbside pickup of recyclables) and repeated efforts by Peter Pocklington, owner of the Edmonton Oilers, to secure concessions from the city in exchange for his agreement not to move the team. Although she has never sought office at the provincial or federal levels, she is a lifelong New Democrat.

Reimer was born in Edmonton in 1952, the daughter of Neil Reimer, who would go on to lead the Alberta New Democratic Party. In 1973, she graduated with a Bachelor of Arts from the University of Alberta. After graduation, she spent three years travelling in Southeast Asia, Australia, and India (serving as a welfare officer in Darwin and Brisbane, Australia from 1975 until 1977). In 1977, she returned to Edmonton, and became the citizens' coordinator of the Calder Action Committee, a neighbourhood advocacy association.

Reimer first sought office in the 1980 municipal election, in which she finished second of eight candidates for alderman in the city's Ward 1, behind incumbent Ron Hayter. As two candidates were elected per ward, this showing was good enough for her to be elected to the Edmonton City Council. She was re-elected in 1983 and 1986, finishing first in fields of six and four, respectively. (Hayter finished second each time and due to the two-seat ward, also was elected each time.)

As an alderman, Reimer was an outspoken critic of many elements of the status quo. She argued that too many concessions were made to land development companies by the city, and also questioned why developers often failed to fulfill the conditions on which council made these concessions contingent. She was critical of council's habit of making important decisions in camera. When the city's solicitor resigned due to a sexual harassment scandal, and council negotiated a $160,000 settlement with him, Reimer expressed frustration that the city's law department was not under the jurisdiction of the city manager, where she felt that the settlement would have been better-handled. She also argued that Edmonton's 1979 annexation of surrounding semi-rural land had been a mistake, asserting that it "[hadn't] benefited Edmonton at all; we'll be paying years down the road for road maintenance and snow clearing in the new areas".

As an alderman, Reimer supported changing aldermen's titles to "councillor", stating that while the title didn't offend her, it should be changed out of respect for others' sensibilities. Early in her third term, she and Hayter jointly called for reform of Edmonton's ward system – specifically, Reimer supported increasing the number of wards from six to twelve and halving the number of aldermen per ward to one. The proposal was defeated, in part because Mayor Laurence Decore said he thought the reform wasn't needed. (The change would finally be made in 2010.)

Reimer also supported increases in aldermanic salaries, suggesting that they had to work harder than members of the Legislative Assembly of Alberta since aldermen need to learn issues themselves and can't fall back on a party platform.

In 1988, mayor Laurence Decore resigned to lead the Alberta Liberal Party, and Terry Cavanagh was selected by council to complete his term. Reimer challenged Cavanagh's bid to keep the job in the 1989 election. The campaign was acrimonious: Cavanagh called Reimer's endorsement by the Canadian Union of Public Employees a "blatant attempt to muscle votes for an opponent," and suggested that Reimer harboured a "socialist hidden agenda" and that the city would become known as "Redmonton" if she was elected.

Reimer won a solid victory although with barely more than half the votes cast.