Theodore D. Mann (May 13, 1922 – April 9, 1994) was an American politician who was the longest-serving mayor of Newton, Massachusetts.

The new main Newton Free Library was built and dedicated to him shortly after he died.

Mann was a 'hands on' mayor, and never failed to show up at any Newton event until he was on his deathbed at Newton-Wellesley Hospital.

He was part of the mission to Poland for the purpose of meeting with mayors in Warsaw and Kraków to work with newly elected officials on how to govern in an atmosphere still clouded due to 30 years of Communist rule.

He was married to the former Florence Ober and together they had five children, Leslie, Richard, Eric, Debbie and, Stacie.