Parker Bowles was educated at the Benedictine Ampleforth College and the Royal Military Academy Sandhurst. He was commissioned into the Royal Horse Guards (The Blues) in 1960. He was aide-de-camp to the Governor-General of New Zealand, Sir Bernard Fergusson, in about 1965. He was then Adjutant Royal Horse Guards (The Blues) 1967–1969. The regiment became The Blues and Royals (Royal Horse Guards and 1st Dragoons) 1969, and he was the Adjutant of The Blues and Royals 1969–1970. Parker Bowles was promoted to major on 31 December 1971.