Wendy Maxine Duncan (née Tonkin; born 7 October 1954) is an Australian politician who was a National Party member of the Legislative Assembly of Western Australia from 2013 to 2017, representing the seat of Kalgoorlie.

[1] Duncan was born in Kalgoorlie, Western Australia, to Shirley Maxine (née Davies) and Stephen John Tonkin.

After leaving school, she spent a year in South Africa through the Rotary Youth Exchange, and then enrolled at the University of Western Australia, eventually graduating with a Bachelor of Arts degree in politics and Australian history.

[3] Returning to Western Australia, she married Ian Murray Duncan in 1980, with whom she had four children, and then worked part-time at legal firms in Kalgoorlie and Esperance.

[4] In her inaugural speech, she expressed concerns about foreign ownership of Australian resources, economic rationalism, the dominance of the two major parties and the neglect of regional and rural areas.

[5] At the 2008 state election, Duncan transferred to the Mining and Pastoral Region, allowing a former party leader, Max Trenorden, to take her old seat.