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• Richard F. Gagen – An outlaw and one of the conspirators in the June 17, 1877 murder of Captain R.N. Calhoun.

• Bill “Barney” Gallagher – New Mexico outlaw, he was killed in 1876 by John Slaughter in South Springs, New Mexico.

• Jack Gallagher, aka: Three-Fingered Jack – An outlaw and member of Henry Plummer’s gang of Innocents. He was hanged by vigilantes on January  13, 1864 in Montana.

• Leandro Gallegos - An outlaw, he was a member of Vicente Silva's White Caps in Las Vegas, New Mexico.

• Nestor Gallegos - An outlaw, he was a member of Vicente Silva's White Caps in Las Vegas, New Mexico.

• Jack Gallagher, aka: Three-Fingered Jack (18??-1864) - Deputy Sheriff in Bannack, Montana and thought to have been a member of Henry Plummer's gang of Innocents. He was hanged by Montana Vigilantes. 

• Manuel Garcia, aka: Three-Fingered Jack (??-1853)

• Pete Garfias - An outlaw, he allegedly robbed a train in 1883 and was killed in a battle.

• Joe Garrett – Outlaw member of the Ike Stockton Gang.

• Catarino Garza – A rebel gunman, Garza organized a gang of over 300 men, crossed the border into Mexico, and fought against Diaz. He was defeated and arrested for violating International Laws. He was later killed in Cuba during a revolution.

• Bill Gibbs, aka: The Panther of the Boston Mountains – An outlaw, he killed five men and was shot and killed by a lawman.

• Bud Gilbreth, aka: Cook – An outlaw and companion of Ike Stockton.

• Jim Gilliand - An accused rustler, Gilliand joined the Oliver Lee faction in the Lee-Good feud in Tularosa, New Mexico.

• Joe George – An Arizona outlaw, he, along with Grant Wheeler, allegedly robbed a Southern & Pacific train near Willcox.

• Augustus M. “Gus” Gildea - A member of Selman’s Scouts following the turmoil of the Lincoln County War in New Mexico. He died of natural causes in Douglas, Arizona on August 10, 1935.

• Charles Glass – Bank Robber Glass was killed in a bank hold up with George Birdwell in Boley, Oklahoma.

• Reason Goble(s) - A member of Selman’s Scouts following the turmoil of the Lincoln County War in New Mexico, he disappeared in 1879 into Texas.

• William Goings – An Oklahoma outlaw and murderer, he was executed in the Choctaw Nation of Indian Territory on July 13, 1899.

• Clarence Goldsby – Oklahoma outlaw and brother of “Cherokee Bill” Goldsby, he killed U.S. Deputy Marshal, Ike Rogers.

• Crawford "Cherokee Bill" Goldsby (1876-1896) - An outlaw killer and member of the Cook Gang. He was hanged for murder at Fort Smith, Arkansas on March 17, 1896.

• Juan Gomez – Outlaw Gomez escaped from prison and was recaptured on February 16, 1907.

• Juan Gonzolez - An outlaw horse thief, he was killed in Albuquerque, New Mexico in October, 1876.

• Manuel Gonzolez y Blea, aka: EI Mellado – Outlaw member of Vicente Silva's White Caps Gang of Las Vegas, New Mexico.

• Marcus Gonzales – Outlaw Gonzales was captured and jailed in La Veta, Colorado. A short time later, he was lynched by a mob in July, 1877.

• Martin Gonzolez y Blea, aka: EI Moro – Outlaw member of Vicente Silva's White Caps Gang of Las Vegas, New Mexico.

• Luther Goodall – A bank robber in Oklahoma.  

• William Goodman – A New Mexico outlaw, Goodman escaped from a Las Vegas, New Mexico jail along with Dave Rudabaugh and Joshua Webb on December 3, 1881.

• Lon Gordon (18??-1894) - Outlaw member of the Bill Cook Gang in Oklahoma, he was killed near Sapulpa, Oklahoma after the Chandler bank robbery.

• Bill Gristy, aka: Bill White (18??-??)

• Tom Gordon – A New Mexico outlaw, Gordon was lynched in Socorro on March 10, 1881.

• Tom Grady – A New Mexico outlaw, Grady rustled cattle and murdered John Carney on December 14, 1885 in Lake Valley, New Mexico.

• Albert “Abbs” Graham, aka: Charles Graves, Ace Carr – An outlaw member of the Jesse Evans Gang, Graham robbed throughout New Mexico and West Texas. He was arrested, but either died or left the country, as he never appeared in court.

• Charles Graham, aka: Bud Davis – Outlaw member of the Jesse Evans Gang and brother of Abbs, he was captured and accused of killing a man while shooting up Jonesboro.

• Dollay Graham, aka: George Davis, George Graves - An outlaw and one of the Graham brothers who rode with Jesse Evans in Lincoln County, New Mexico. He was killed when the gang was captured in West Texas.

• William “Whiskey Bill” Graves - A road agent in Montana and thought to have been a member of Henry Plummer's gang of Innocents. He was hanged by Montana Vigilantes at Bitter Root in January, 1864.  

• Aaron Grayson – Oklahoma outlaw and murderer

• Jim Grayson – Oklahoma horse thief.

• James Greathouse, aka: Whiskey Jim - A former deputy sheriff labeled an outlaw by ranger Patrick Garrett, ran a way station on the White Oaks-Las Vegas, New Mexico, road. Shot to death southeast of Socorro.

• Tom Green - An outlaw, he was indicted for murder in 1877 at Parker County, Texas.

• Richard Green – Oklahoma horse thief and member of Sam Green’s Gang.

• Sam Green – Led an outlaw gang in Oklahoma. He killed Sheriff Jack Bullard and Deputy Sheriff Cogburn in Roger Mills County.

• Dick Grey – An  outlaw in Arizona and New Mexico.

• Francisco “Pancho” Griego - An outlaw and former city marshal of Santa Fe, New Mexico, he was killed by Clay Allison on November 1, 1875 at Cimarron, New Mexico.

• Ben Griffith - A guerilla outlaw under Cullen Baker in the Texas reconstruction war, was killed by three citizens of Glarkville in 1868.

• Albert Gross, aka: John Gunter – An outlaw member of the Jesse Evans gang, he was captured by Texas Rangers near Shafter, Texas, on July 3, 1880. Later, he escaped briefly but recaptured by Ranger Sam Graham.

• Buck Guyse - A lawman and outlaw, he deserted the Texas Rangers and fled to New Mexico where he was arrested by Pat Garrett.