North Midlands 3 was a tier 11 English Rugby Union league with teams from Birmingham, Herefordshire, Shropshire and Worcestershire taking part. Promoted teams moved up to North Midlands (South) 2 and since the cancellation of North Midlands 4 at the end of the 1991–92 campaign there was no relegation. North Midlands 3 was cancelled at the end of the 2003–04 season with teams transferred into either North Midlands (South) 2 or North Midlands (North).
Restructuring of the Midlands leagues saw North Midlands 3 drop two levels to become a tier 11 league. Promotion continued to North Midlands 2 and since the cancellation of North Midlands 4 at the end of the 1991–92 season there would be no relegation.
The top six teams from Midlands 1 and the top six from North 1 were combined to create National 5 North, meaning that North Midlands 3 dropped another level to become a tier 12 league. Promotion continued to North Midlands 2 and there was no relegation. At the end of the 1995–96 season North Midlands 3 was cancelled and all clubs transferred into North Midlands 2.
North Midlands 3 was reintroduced after an absence of three seasons - this time as a level 11 league. Promotion was to North Midlands 2 and there was no relegation. At the end of the 2003–04 season the division was cancelled for good and all teams transferred into either North Midlands (South) 2 or North Midlands (North).
^Restructuring of the Midlands leagues meant that champions were promoted two levels up into North Midlands 1.
^Restructuring meant that runners up were also promoted two levels up into North Midlands 1. The rest of the clubs in the division were promoted into North Midlands 2.
^The cancellation of North Midlands 4 at the end of the season, combined with all clubs being promoted from North Midlands 3, meant there was no relegation.
^The cancellation of North Midlands 3 at the end of the season meant that all clubs were promoted into North Midlands 2.
^The cancellation of North Midlands 3 meant that all seven clubs were promoted from the division. Six teams went up into North Midlands 2 (South), while the other () went into North Midlands (North).