Robert Rennick Dalton (May 13, 1869 – October 5, 1892), better known as Bob Dalton, was an American outlaw in the American Old West. Beginning in 1891, he led the Dalton Gang, whose varying members included three of his brothers. They were known for robbing banks, stagecoaches and trains, primarily in Kansas and Oklahoma Territory, quickly attracting pursuit by lawmen.
On October 5, 1892 the gang attempted to rob two banks the same day in Coffeyville, Kansas, hoping to gain enough loot to leave the country. Attacked by townsmen and law officers, Bob and Grat Dalton, Bill Power, and Richard L. "Dick" Broadwell were all killed. Younger brother Emmett Dalton was severely wounded, but survived. He was tried and convicted, and served 14 years in prison before being pardoned. Bill Dalton was not part of this heist.