Sussex 1 (known as Harvey's of Sussex 1 due to sponsorship reasons) is an English level 9 Rugby Union League. It is made up of teams predominantly from Sussex. Teams play home and away matches from September through to April. The league champions are automatically promoted up to London 3 South East, while the second placed team plays a promotion playoff against the second placed team from Kent 1. Relegated teams drop to Sussex 2 although in recent season there has been no relegation. Only 1st XV sides can be promoted into London 3 South East.