Leicestershire 1 was a tier 10 English Rugby Union league with teams from Leicestershire taking part. Promoted teams moved up to East Midlands/Leicestershire 1 and relegated teams dropped to Leicestershire 2. The league ran for two spells between 1987–1992 and 1996–1998 before it was permanently cancelled and the majority of teams transferred into either East Midlands/Leicestershire 1 or East Midlands/Leicestershire 2.