It takes place on Saturday April 23 at 2pm and will be led by Bucks County Council chairman Bill Chapple OBE.
Bugler Max Farmer will be playing the trumpet during the service.
Bible readings will be led by Lord Lieutenant Sir Henry Aubrey-Fletcher and High Sheriff Milly Soames while the Bishop of Buckingham Rev Alan Wilson will give the address.
Cllr Chapple said: “This is such a great opportunity to honour The Queen’s dedication and commitment to the people of our country, with some rousing hymns and gratitude to God.
“I hope many residents of Buckinghamshire will join us.”