First Rules derby is held between Sheffield F.C. and Hallam F.C., the oldest football fixture in the world.

Rules derby is a football derby played in Sheffield, England between Sheffield F.C. and Hallam F.C. It was first played on 26 December 1860 and is the oldest football fixture in the world. The name refers to the fact that the fixture was originally played under the Sheffield Rules.

Sheffield Football Club is an English football club, currently based in Dronfield, Derbyshire. They compete in the Northern Counties East League Premier Division, on the ninth level of the English football pyramid. Founded in October 1857, the club is considered by FIFA as the oldest existing independent club still playing football in the world.

Hallam Football Club is an English football club based in Crosspool, Sheffield, South Yorkshire. Hallam have played at their Sandygate home in the Sheffield suburb of Crosspool since 1860, with the ground being officially recognised by the Guinness Book of Records as "The Oldest Football Ground in the World". In 1867, the club made history by winning the world's first ever football tournament, the Youdan Cup.

December 26 is the 360th day of the year in the Gregorian calendar; five days remain until the end of the year.