John Frederick Hamm OC (born April 8, 1938) is a Canadian physician and politician, who served as the 25th premier of Nova Scotia from 1999 to 2006.

In 2001, Hamm was at odds with the Nova Scotia Government Employees Union, trying to legislate nurses back to work after a legal strike.

The main issue in that election was the increasing cost of car insurance and whether Nova Scotia should begin to allow general Sunday shopping.

In 2009, he was made an Officer of the Order of Canada "for his contributions to the province of Nova Scotia as a former premier, family physician and community leader.

Also in October 2014, John Hamm was appointed the Honorary Colonel for the 1st Battalion Nova Scotia Highlanders (North) for the next three years.