"In Dulci Jubilo"/"On Horseback" is a double A-side single and third overall by English musician Mike Oldfield, released in November 1975 by Virgin Records. It features an instrumental version of the German traditional Christmas carol "In dulci jubilo" and Oldfield's second version of the song following an earlier recording released as the B-side to his previous single, "Don Alfonso". The song "On Horseback" is the final and previously untitled section to "Ommadawn (Part Two)" from his third studio album Ommadawn, released just one month before. The single is certified Silver by the British Phonograph Institute for selling 200,000 copies in the UK.