Gilgel Gibe River (with Gilgel meaning Little) is a major tributary of the larger Gibe River in southwest Ethiopia in western Oromia Region. It flows in an arc through the south of the Jimma Zone, defining part of the Zone's boundary with that of the Southern Nations, Nationalities, and Peoples' Region as it turns north. It then joins the eastwards flowing Gibe River less than ten miles from its own confluence with the Omo River.