John E. Mann is an American politician in New Hampshire.
Mann graduated from Brookline High School. Mann earned a A.B. from Harvard College in 1961. Mann served in the United States Navy from 1961 to 1965. He later worked in the technology industry, taught high school mathematics, and earned at Master of Arts in Teaching at Harvard.
On November 6, 2012, Mann was elected to the New Hampshire House of Representatives, representing the Cheshire 2 district. He assumed office on December 5, 2012. Mann is a Democrat.
Mann resides in Alstead, New Hampshire. He is married and has three children.