Hiram Burnham (1814 – September 29, 1864) was an officer in the Union Army who commanded a regiment and then a brigade in the Eastern Theater of the American Civil War.

Active in local politics, he held public office as a county commissioner and a coroner.

Early in the war Burnham became lieutenant colonel of the 6th Maine Infantry on July 16, 1861.

In 1863, a "Light Division" of VI Corps, composed of five regiments, was organized under General Pratt.

[3] However, Pratt resigned his post and Burnham led the division from May 3 to May 11, including at the Second Battle of Fredericksburg, where he was wounded, temporarily relinquishing command.

The Light Division made up the rightmost column in Maj. Gen. John Sedgwick’s attack on Marye’s Heights on May 3.

[5] Burnham's Light Division was the right flank anchor of Sedgwick's line when VI Corps stood on the defensive during the later stages of the Battle of Salem Church.

Only lightly engaged, Burnham was able to send two regiments to help repel a Confederate attack on the left flank.

The 6th Maine of Burnham's command was one of the rearguard units when the corps retreated across the Rappahannock River.