"The Roast Beef of Old England" is an English patriotic ballad. It was written by Henry Fielding for his play The Grub-Street Opera, which was first performed in 1731. The lyrics were added to over the next twenty years. The song increased in popularity when given a new setting by the composer Richard Leveridge, and it became customary for theatre audiences to sing it before, after, and occasionally during, any new play. The Royal Navy always goes in to dine at Mess Dinners to the tune, which is also played at United States Marine Corps formal mess dinners during the presentation of the beef. Officers of the Royal Artillery are also played in to dinner by this tune.
The song provided the popular title for a 1748 painting by William Hogarth: O the Roast Beef of Old England (The Gate of Calais).