Brigadier Oldipo Diya was born on the 3rd of April, 1944 at Odogbolu in the Ijebu-Ode Local Government Area of Ogun State. He attended Yaba Methodist School, Lagos from 1950 – 1956 and thereafter proceeded to Odogbolu as a pioneer student from 1957 – 1962.
He joined the Nigerian Army through direct entry, having been exempted from qualifying examination on the strength of his West African Senior School Certificate result. After three and half years of intensive military training at the Academy, he was commissioned a Second Lieutenant in March, 1967.
Brigadier Diya, a regular combatant soldier served in various positions in the Nigerian Army since his commission as 2nd Lieutenant in 1967. He was a Platoon Commander of the 6th Battalion, Ikeja, a post he held until 1968 when he became the Commanding Officerof the 101 Battalion of the Nigerian Army. He was also the Deputy Adjutant-General of the Nigerian Army and Director of Personnel Services between 1973 – 1976 among others.
Internationally, Brigadier Diya commanded the Nigerian contingent in the Peace Keeping Operations of the United Nation’s Interim Force in Lebanon in1980. In addition, he was the Chief Military Personnel Officer for the entire United Nations Interim Force in Lebanon within the same period. Brigadier Diya is happily married with children.