Scottish National League Division One
| Formerly | National League, Premiership Division Two |
|---|---|
| Sport | Rugby union |
| Founded | 1973 |
| No. of teams | 10 |
| Country | Scotland |
| Most recent champion | GHA (1st title) |
| Most titles | Kelso and Stirling County (5 titles) |
| Level on pyramid | 2 |
| Promotion to | Premiership |
| Relegation to | National League Division Two |
| Domestic cup | Scottish Cup |
The Scottish National League Division One (known as Arnold Clark National League Division 1 for sponsorship reasons) is the second tier of the Scottish League Championship for amateur rugby union clubs in Scotland.
The division was established in its current format in 2014, with the creation of three national leagues below the Premiership.
For the 2023–24 season, the division was reduced from 12 to 10 teams.