The Scottish National League Division One (known as Tennent's 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.

[1] The winners are promoted to the Scottish Premiership, with the runners-up entering a play-off at a neutral venue against the 9th-placed team in the Premiership.

The bottom two teams are relegated to Scottish National League Division Two.

Promoted from 2022–23 National League Division 2 Relegated from 2022–23 Scottish Premiership The Super 6 clubs were also allowed to run 2XV sides in this league for the 2019–20 season (not shown on map).