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.
Original teams
When league rugby began in 1987, this division contained the following teams:
After an absence of four seasons Leicestershire 1 was reintroduced, this time sitting at tier 10 of the league system. Promotion was to East Midlands/Leicestershire 1 and there was no relegation. Remerging of all the East Midlands and Leicestershire leagues meant that Leicestershire 1 was cancelled at the end of the 1997–98 season and the majority of teams transferred into East Midlands/Leicestershire 2.