Peter Mbiyu Koinange (Born Mbiyu wa Koinange in 1907 in Njunu, Kiambu District- Died September 2, 1981) was a politician from Kenya. He served in the government and cabinet of Kenya's first president, Jomo Kenyatta for 16 years. During this time, he held the post of Member of Parliament for the Kiambaa constituency and the portfolios of Minister of State for Education, External Affairs, Pan-African Affairs, as well as Minister of State in the Office of the President.
Mbiyu was the eldest son of Koinange Wa Mbiyu, a prominent Kikuyu chief during Kenya's colonial period, and Wairimu, the chief's first wife. He was one of seven children, with another six siblings who died either at birth or early on in their childhood. His elder sister, Isabella, was one of Kenya's first trained African nurses, while his younger brother, Charles Karuga Koinange, served as a colonial chief and was a civil servant in independent Kenya for more than 30 years.
Mbiyu Koinange moved to the United States in 1927 for studying. He went to Hampton Institute in Virginia, where he graduated in 1931. Koinange then started at Ohio Wesleyan University in Delaware, Ohio in 1931, completing a four-year bachelors degree in 1935. From Ohio, Koinange then received a one-year postgraduate certificate in education from Columbia University in 1936. Mbiyu Koinange then spent a year at the University of Cambridge, St. John's College as a Rhodes Scholar, followed by a year at the University of London Institute of Education before returning to Kenya in 1939.
He was the Kiambaa Constituency MP from 1963 to 1979 when Njenga Karume was elected the Kiambaa MP. He also served as the foreign minister of Kenya.