Lieutenant General Arnold Quainoo is a Ghanaian former military officer and served as the Chief of Defence Staff of the Ghana Armed Forces from August 1983 to September 1989.^[1] He took over from Flight Lieutenant J. J. Rawlings and handed over to Lieutenant General Winston Mensa-Wood.^[1] He was also the first commander of the Economic Community of West African States Monitoring Group (ECOMOG) which intervened in Liberia to help end the civil war.^[2] He also served twice as Army Commander, first in 1979 following the coup-d'état by the Armed Forces Revolutionary Council which overthrew the Supreme Military Council. He was replaced when the Limann government was elected. He was however re-appointed as Chief of Army Staff following the coup by the Provisional National Defence Council^[3] and later as General Officer Commanding the Ghana Armed Forces.^[4]

In 2014, Quainoo denied any responsibility for the death of Liberian President Samuel Doe.^[5]