Newton Martin Curtis (May 21, 1835 – January 8, 1910) was a Union officer during the American Civil War and a member of the United States House of Representatives from New York.

His enormous size for the time period prompted even Abraham Lincoln to quip, "Mr. Curtis, how do you know when your feet are cold?"

His stature became an issue of concern to his family when the Civil War began as they felt he would surely be an easy target for enemy bullets.

Curtis received a brevet promotion to brigadier general on October 28, 1864, for his actions at the Battle of New Market Heights.

After the war, Curtis was a collector of customs in the district of Oswegatchie, New York, in 1866 and then a Special Agent for the United States Treasury Department from 1867 until 1880.

At the Second Battle of Fort Fisher: the first man to pass through the stockade, he personally led each assault on the traverses and was 4 times wounded.