Prince Birabongse Bhanudej Bhanubandh (Thai: พีรพงศ์ภาณุเดช; RTGS: Phiraphong Phanudet; 15 July 1914 – 23 December 1985), better known as Prince Bira of Siam (now Thailand) or by his nom de course B. Bira, was a member of the Thai royal family, racing driver, sailor, and pilot.