North Midlands (South) 1 (formerly North Midlands 1) was a tier 9 English Rugby Union league with teams from Birmingham, Herefordshire, Shropshire and Worcestershire taking part.

The northern section was cancelled after just one season and the majority of teams transferred into the new Midlands 5 West (North).

At the end of the 2005–06 season the southern section (and North Midlands leagues) were cancelled for good, and the teams transferred into a variety of divisions based on final table standings, including Midlands 5 (West North), Midlands 5 West (South), Midlands 6 West (North) and Midlands 6 West (South-West).

When league rugby began in 1987 this division contained the following teams: The original North Midlands 1 was a tier 7 league involving clubs from Birmingham and the West Midlands[c].

At the end of the 2005–06 season North Midlands (South) 1 was cancelled and the majority of teams transferred to the newly introduced Midlands 5 West (North) and Midlands 5 West (South) divisions.