Grace Hartman (née Armstrong; 1900 – May 23, 1998), when she was selected by city council following the death of the city's previous mayor, Max Silverman. However, in the municipal elections the following year, Hartman was defeated when the city's popular longtime mayor Joe Fabbro, Silverman's predecessor, stood for election again.
Hartman had previously campaigned for mayor in 1956, losing to Fabbro. She served on council until 1954, when she was elected the city's comptroller.
Hartman was also a president of the Ontario Municipal Association, a board member of the Royal Ontario Museum, and a chair of several social service and community organizations in Sudbury.
In 1975, Hartman was named one of the 25 leading women of Ontario.