Thomas Norton Hart (January 20, 1829 – October 4, 1927) was an American manufacturer,[3] businessman,[3] and politician from Massachusetts who served as mayor of Boston from 1889 to 1890 and from 1900 to 1902.

Thomas Norton Hart was born in North Reading, Massachusetts on January 20, 1829, coming to Boston when he was young and penniless, in hope of becoming wealthy.

He was known for his opposition to granting a franchise to the Bay State Gas Company "to enter the streets of Boston for the sole purpose of making money".

He remained an active figure in Boston politics, running for mayor and being defeated by the incumbent, Nathan Matthews Jr., in 1893 by a margin of 5,099.

He opposed reforms within the Boston City Council and was against increased funding for projects unrelated to infrastructure.