The Oklahoma Land Rush of 1889 was the first land run into the Unassigned Lands of former Indian Territory, which had earlier been assigned to the Creek and Seminole peoples. The area that was opened to settlement included all or part of the Canadian, Cleveland, Kingfisher, Logan, Oklahoma, and Payne counties of the present-day US state of Oklahoma.

A land run or land rush was an event in which previously restricted land of the United States was opened to homestead on a first-arrival basis. Lands were opened and sold first-come or by bid, or won by lottery, or by means other than a run. The settlers, no matter how they acquired occupancy, purchased the land from the United States General Land Office. For former Indian lands, the Land Office distributed the sales funds to the various tribal entities, according to previously negotiated terms. The Oklahoma Land Rush of 1889 was the most prominent of the land runs while the Land Run of 1893 was the largest. The opening of the former Kickapoo area in 1895 was the last use of a land run in the present area of Oklahoma.