Wendy Lill (born November 2, 1950) is a Canadian playwright, screenwriter and radio dramatist who served as an NDP Member of Parliament from 1997 to 2004. Her stage plays have been performed extensively in theatres across Canada as well as internationally in such countries as Scotland, Denmark and Germany.

Many of the plays explore the divide between the powerful and the oppressed, exploring, for example, the racism and abuse suffered by Canada's indigenous peoples, issues faced by people with disabilities, child sexual abuse and women's rights. Four of her plays were nominated for Governor General's Awards. Sisters, which dramatizes the human devastation caused by a convent-run, native residential school, received the Labatt's Canadian Play Award at the Newfoundland and Labrador Drama Festival. Lill's adaptation of Sisters for television earned her a Gemini Award in 1992.

Before writing her first produced play, On the Line, based on a strike by female garment workers in Manitoba, Lill worked as a journalist, documentary-maker and dramatist for CBC Radio in Winnipeg, Manitoba. Among other things, she covered a paper mill strike in Kenora, Ontario and produced documentaries for Our Native Land, a national, weekly program about Canada's indigenous peoples. Her documentary Who is George Forest? and her radio drama Shorthanded won ACTRA Awards in 1981. Her screenplay Ikwe, about Métis women, was part of a National Film Board series which received a Golden Sheaf Award at the Yorkton Film Festival in 1986.

During her seven years as a Member of Parliament, Lill served as her party's culture and communications critic as well as its advocate for human rights, children and youth, and people living with disabilities.

She was a member of the Standing Committee on Canadian Heritage where she contributed to the recommendations that resulted from three major studies: the federal government's role in supporting arts and culture; the state of the Canadian book publishing industry in an era of big-box retailers and declining independent bookstores; and, the importance of public and private broadcasting in protecting Canada's cultural sovereignty.

Wendy Lill was born in Vancouver, British Columbia, the daughter of Edwin Henry Lill and Margaret Galbraith Gordon. Her family moved to London, Ontario when she was five. She received a BA in Political Science from York University in 1971. After graduation, she toured Europe, worked as a cocktail waitress and began writing poetry.

Anxious to get away from Toronto, Lill moved north to Kenora, Ontario, in 1977 where she worked as a mental health consultant. "That was a silly job for me because I had no experience and I wasn't that type of person," Lill told an interviewer later. "But I did it for six months, basically trying to ascertain whether a Canadian Mental Health Association would be useful in Northern Ontario. Well, that's sort of like saying, 'Would an aspirin be useful in Bangladesh?'" Lill concluded there were already 44 associations in Kenora, none of them effective in dealing with the socio-economic problems that resulted in alcoholism and violence.

After quitting her mental health job, Lill began working for a native newspaper, flying to remote reserves where she "spent a lot of time sleeping on floors in nursing stations." Her experiences in northwestern Ontario changed her life. "I began to see the whole level of community relationships between natives and whites in the north, and the historical abuse of power, the racism," she told a journalist in 1998. "It was the first time I had ever seen that, and I was shocked." At age 26, Lill began writing stories based on her experiences—stories that would later form the basis for her one-woman play, The Occupation of Heather Rose.