Okumu is a surname. Notable people with the surname include:
Caroline King-Okumu, geographer Dave Okumu (born 1976), Austrian musician, songwriter, and producer Godfrey Okumu, Kenyan volleyball coach John Sibi-Okumu, Kenyan actor Joseph Okumu (born 1997), Kenyan footballer Washington Aggrey Jalang'o Okumu (1936–2016), Kenyan diplomat, politician and author