The 1997–98 Spartan South Midlands Football League season was the first in the history of Spartan South Midlands Football League. The league was formed by the merger of the Spartan League and the South Midlands League.
The league consisted of 75 clubs divided into five divisions.
For this season only both Premier Division and Division One were split geographically into two sections, as the Premier Division North was a successor of the South Midlands League Premier Division, and the Premier Division South was a successor of the Spartan League Premier Division. Senior Division was a successor of the South Midlands League Senior Division. Division One North was a successor of the South Midlands League Division One, and the Division One South was a successor of the Spartan League divisions One and Two.
At the end of the season Premier divisions were merged, while Division One North was renamed Division One as all the Division One South clubs resigned from the league and formed the London Intermediate League.
| Competition: | Spartan South Midlands Football League Premier Division North |
| Season: | 1997–98 |
| Winners: | Brache Sparta |
| Relegated: | Letchworth Biggleswade Town Milton Keynes Bedford United Langford |
| Matches: | 210 |
| Total Goals: | 714 |
| Prevseason: | 1996–97 (South Midlands League) |
| Nextseason: | 1998–99 (Premier Division) |
The division featured 15 clubs, all came from the South Midlands League Premier Division.
| Competition: | Spartan South Midlands Football League Premier Division South |
| Season: | 1997–98 |
| Winners: | Brook House |
| Relegated: | Hanwell Town Harefield United Amersham Town Cockfosters |
| Matches: | 210 |
| Total Goals: | 714 |
| Prevseason: | 1996–97 (Spartan League) |
| Nextseason: | 1998–99 (Premier Division) |
The division featured 15 clubs, all came from Spartan League Premier Division.
| Competition: | Spartan South Midlands Football League Senior Division |
| Season: | 1997–98 |
| Winners: | New Bradwell St Peter |
| Relegated: | The 61 FC Luton Kent Athletic Ampthill Town |
| Matches: | 240 |
| Total Goals: | 986 |
| Prevseason: | 1996–97 (South Midlands League) |
| Nextseason: | 1998–99 |
The division featured 13 clubs which competed in the previous season South Midlands League Senior Division, along with three new clubs.
| Competition: | Spartan South Midlands Football League Division One North |
| Season: | 1997–98 |
| Winners: | Luton Old Boys |
| Promoted: | Luton Old Boys Greenacres |
| Matches: | 240 |
| Total Goals: | 912 |
| Prevseason: | 1996–97 (South Midlands League) |
| Nextseason: | 1998–99 (Division One) |
The division featured 16 clubs which competed in the previous season South Midlands League Division One, along with one new club:
| Competition: | Spartan South Midlands Football League Division One South |
| Season: | 1997–98 |
| Winners: | Old Roan |
| Matches: | 155 |
| Total Goals: | 778 |
| Prevseason: | 1996–97 (Spartan League) |
The division featured ten clubs which competed in the previous season Spartan League divisions One and Two, along with five clubs: