Gunfighter Henry Newton Brown (1857 – April 30, 1884) was an American Old West gunman who played the roles of both lawman and outlaw during his life.

An orphan, he lived there with his uncle Jasper and aunt Aldamira Richardson until the age of seventeen, when he left home and headed west.

Brown joined Billy the Kid and cowboys as "The Regulators", working John Tunstall's Rio Feliz Ranch.

On April 1, 1878, Brown, Billy the Kid, Jim French, Frank McNab, John Middleton and Fred Waite ambushed and murdered Lincoln County Sheriff William Brady, who was indirectly responsible for the death of Tunstall.

Roberts received a serious gunshot wound from Charlie Bowdre which later proved to be fatal, but not before he managed to kill the Regulators' nominal leader, Richard M. Brewer.

Henry Brown was one of three Regulators not actually in McSween's house at the time, but instead was sniping at Brady's men from a grain warehouse behind the Tunstall store.

McSween was shot down while fleeing the blaze, and his death essentially marked the end of the Lincoln County Cattle War.

In the fall of that year, Brown, Billy the Kid, and a few of the remaining Regulators trailed a herd of rustled horses to the little town of Tascosa in the Texas Panhandle.

After the horses were sold the Regulators returned to their old haunts, but Brown, named in two murder warrants in the state of New Mexico, wisely remained in Texas where he eventually became a lawman.

Brown was described by contemporaries as a "very much undersize" man who didn't smoke, drink, chew, or gamble, and was noted to be in regular attendance at the Methodist Church.

In April, 1884, Brown and Wheeler concocted a story convincing the mayor to give them leave to travel into the Indian Territory to hunt a murderer.

Wheeler (and possibly, Wesley) shot George Geppert, the bank's chief cashier who, just before he died, sealed the vault, preventing the robbers from escaping with any money.

Brown and the outlaws fled under fire, pursued by a posse composed of 12 cowboys that happened to be in a stable directly across the street from the bank.

The four fugitives, closely pursued by the posse, unwittingly rode into a box canyon several miles south of the town and were eventually forced to surrender.

Later, incarcerated in the town's small jail, they anticipated a lynch mob, and were offered the opportunity to write letters to their loved ones.

In the film Chisum, when Billy proposes robbing Murphy's bank to help avenge his murdered employer, Tom O'Folliard recommends Brown as a man to recruit for the raid.

Timid and clumsy, the film's portrayal of French by actor Alan Ruck bears little actual resemblance to either outlaw.

The actor William Smith played Brown in the 1969 episode "The Restless Man" of the syndicated television series Death Valley Days, hosted by Robert Taylor.