The Sussex Transport Senior Cup is the longest running cup competition in the county having first been played for in the 1882/83 season, shortly after the founding of the Sussex County FA.

Beginning in September, the competition proceeds as a knockout tournament throughout its duration, consisting of three rounds, then quarter-finals, semi-finals and the final, usually in May. A system of byes ensures that the highest placed 'Senior A' and 'Senior B' clubs in Sussex enter the competition in the second round.