Robert Galbreath Jr. (1863–1953) was an American pioneer entrepreneur, wildcatter and oilman in Oklahoma. A native of Ohio, he traveled to Kansas and California in the late 19th century. Returning East by way of Indian Territory, he participated with his brother, Herman, in the Land Rush of 1889 for the Unassigned Lands. Afterward, he sold his claim and settled in the new town of Edmond. He became an early wildcatter and oil producer. His most notable accomplishment was the discovery of the Glenn Pool oilfield.