Prince Harry, who is training to be a Troop leader in the Blues and Royals, will ride in the first barouche - an 18th century landau finished in royal Claret formerly used by the Queen Mother.
He is set to be wearing military dress at the Parade for the first time.
The 21-year-old, known as Cornet Wales, will be dressed in the Blues and Royals' No 1 (blues) uniform.
He will also wear the Jubilee medal given to him by his grandmother the Queen during the Golden Jubilee. Harry will ride in the carriage with his uncle the Duke of York and cousins Princesses Beatrice and Eugenie.