3rd New Jersey Volunteer Infantry

The 3rd New Jersey Volunteer Infantry was an American Civil War Union Army regiment of infantry from New Jersey that served in the Army of the Potomac.

It was recruited and mustered into Federal service in May 1861, and was brigaded with the 1st New Jersey Volunteer Infantry, the 2nd New Jersey Volunteer Infantry, and the 4th New Jersey Volunteer Infantry to make up what became famed as the "First New Jersey Brigade". The regiment and brigade served as the 1st Brigade of the 1st Division of the VI Corps, and participated in numerous battles from the June 27, 1862, Battle of Gaines Mill, Virginia, to the final Union assaults on Confederate positions at Petersburg, Virginia, in April 1865.

The remnents of the 3rd New Jersey Volunteer Infantry were mustered out in June 1865.

Notable members of the 3rd New Jersey were:

• Colonel George W. Taylor (later a Brigadier General and commander of the brigade until mortally wounded)
• Colonel Henry Brown - succeeded George Taylor as regiment commander, and later commanded the brigade)
• 1st Lieutenant Edward Burd Grubb, Jr. - brevetted Brigadier General at the end of the war
• Lieutenant Colonel Mark Wilkes Collet - later Colonel of the 1st New Jersey Volunteer Infantry
• Lieutenant Colonel James N. Duffy - aide to Major General George G. Meade, and post-war commissioner of the New Jersey Gettysburg Battlefield Commission, which was responsible for the creation and placement of New Jersey monuments at the Gettysburg National Military Park.