Theodore Trapplan "Tappan" Michael Wentworth (February 24, 1802 – June 12, 1875) was an American lawyer and politician who served one term as a U.S. representative from Massachusetts from 1853 to 1855.

Wentworth was born in Dover, New Hampshire, on February 24, 1802. He received a liberal schooling, and worked as a store clerk in Portsmouth, New Hampshire, and South Berwick, Maine.

He then studied law with William Burleigh, was admitted to the bar in 1826, and commenced practice in York County, Maine.

He moved to Lowell, Massachusetts, in 1833 and continued the practice of law. Wentworth was a member of the committee which drafted Lowell's city charter, and was a member of the Lowell city council from 1836 to 1841, and was the council president beginning in 1837.

He served in the Massachusetts House of Representatives in 1851, 1859, 1860, 1863, and 1864, and in the Massachusetts State Senate in 1848, 1849, 1865, and 1866.

Wentworth was elected as a Whig to the Thirty-third Congress, defeating Henry Wilson. He served from March 4, 1853, to March 3, 1855, and was an unsuccessful candidate for reelection in 1854 to the Thirty-fourth Congress.

After leaving Congress, Wentworth returned to practicing law. He was also active in several business ventures including railroads and banking, and served as president of Rhode Island's National Rubber Company.

He died in Lowell on June 12, 1875, and was interred in Lowell Cemetery.