Suzanne M. Duff CM ONL (née Frecker;[1] born August 22, 1936)[2] is a Canadian politician who has served as the 12th mayor of St. John's from 1990 to 1993 and as a member of the Newfoundland and Labrador House of Assembly.

[3] Duff entered municipal politics in 1977 as a member of St. John's City Council.

[5] Unusually, she did not resign her city council seat, but continued to hold both positions with the intention of completing her term on city council,[6] but resigned the provincial seat to run for mayor of St. John's in 1990 after incumbent mayor John Joseph Murphy announced that he would not run for another term.

[3] Upon her announcement, council colleague Gerry Colbert praised Duff particularly for her efforts to preserve the city's distinctive architectural heritage.

[3] Duff was appointed to the Order of Canada on March 29, 2003, for outstanding community service.