The 11th New Hampshire Infantry Regiment was a Union army infantry regiment that participated in the American Civil War. It was raised in the New England state of New Hampshire, serving from October 4, 1862, to June 4, 1865.

On September 2, 1862, the regiment was organized and mustered in at Concord, New Hampshire. Among its notable officers was Walter Harriman, a future Governor of New Hampshire.

From September 11 to 14, 1862, the 11th moved to Washington, D.C. It was attached to Briggs' Brigade, Casey's Division, Military District of Washington, until October 1862, and then to the 2nd Brigade, 2nd Division, 9th Army Corps, Army of the Potomac, until March 1863. From then, its assignments were:

• 2nd Brigade, 2nd Division, 9th Army Corps, Dept. of the Ohio, to June 1863.
• 2nd Brigade, 2nd Division, 9th Army Corps, Army of the Tennessee, to August 1863.
• 2nd Brigade, 2nd Division, 9th Army Corps, Dept. of the Ohio, to April 1864.
• 2nd Brigade, 2nd Division, 9th Army Corps, Army of the Potomac, to June 1865.

The regiment lost during its term of service 5 officers and 140 enlisted men killed and mortally wounded, and 1 officer and 151 enlisted men by disease, for a total of 297 fatalities.

• List of New Hampshire Civil War Units

• NH State House Visitor's Center - Hall of Flags: Regiments
• USGNNET.org - Eleventh New Hampshire Regiment Rosters
• A history of the Eleventh New Hampshire Regiment, Volunteer Infantry in the rebellion war, 1861-1865: covering its entire service, with interesting scenes of army life, and graphic details of battles, skirmishes, sieges, marches, and hardships, in which its officers and men participated (1891) at the Internet Archive
• With the Ninth Army Corps in East Tennessee (1891) at the Internet Archive

• Waite, Otis F. R., New Hampshire in the Great Rebellion. Claremont, NH: Tracy, Chase & company, 1870.

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