Scottish National League Division One

{{Infobox sports league

| title = Scottish National League Division One

| logo =

| pixels = 250px

| caption =

| sport = Rugby union

| founded = 1973

| formerly = National League, Premiership Division Two

| teams = 10

| level = 2

| pyramid = Scottish rugby union system

| country = {{SCO}}

| champion = Kelso (5th title)

| most_champs =

| most successful club = Kelso and Stirling County (5 titles)

| promotion = Premiership

| relegation = National League Division Two

}}

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.

For the 2023–24 season, the division was reduced from 12 to 10 teams.{{Cite web |last=Gould |first=Caitlin |date=2023-04-25 |title=Revised season structures for men’s game unveiled by Scottish Rugby |url=https://scottishrugby.org/revised-season-structures-for-mens-game-unveiled-by-scottish-rugby/ |access-date=2023-07-02 |website=Scottish Rugby |language=en-US}}

{{Location map+ |Scotland|width=400 |float=right |caption=Location of teams in 2021–22 Scottish National League Division One |places=

{{Location map~ |Scotland |marksize=6 |lat=55.6120998 |long=-3.5298675 |label=Biggar|position=bottom}}

{{Location map~ |Scotland |marksize=6 |lat=55.8086514 |long=-4.2808011 |label=Cartha Queens Park|position=top|label_width=4}}

{{Location map~ |Scotland |marksize=6 |lat=56.4709896 |long=-2.939391 |label=Dundee HSFP|position=top}}

{{Location map~ |Scotland |marksize=6 |lat=55.6076388 |long=-2.785461 |label=Gala|position=left}}

{{Location map~ |Scotland |marksize=6 |lat=57.4615951 |long=-4.2432347 |label=Highland|position=bottom}}

{{Location map~ |Scotland |marksize=6 |lat=55.6028807|long=-2.4379848|label=Kelso|position=top}}

}}