There have been a few leagues that could be classed as 'international' in status, ie featuring clubs from Scotland and England. Technically this should also include the Scottish League due to Berwick Rangers involvement, but for obvious reasons this is not included here.
Anglo-Scottish LeagueIn 1955 a number of top class teams banded together to form a floodlight league. Although this was never granted official status and the games were officially billed as friendlies, club programmes and newspapers frequently showed league tables.
Border Amateur LeagueNot to be confused with the Border (Senior) League, two cross border leagues operated in the early 1900s, one centred around Berwick-upon-Tweed and on Carlisle.
Scotland has had only two truly national leagues, the Scottish League and SPFL, and that was only after the election of four Highland League clubs after 1994. Before this the leagues that had 'Scottish' in their title were in reality regional in membership, with mainly a western bias. However I have included such leagues here as most did start with high ambitions, stretching across the central belt, but circumstances would eventually get in the way...
Inter City League Supplementary competitions for Scottish League clubs, played between 1899 and 1906, with a second in 1908-09.
Provincial League Formed in 1927, a year after the collapse of the Scottish Third Division. This lasted just one season before it to was wound up.
Scottish Alliance This popular name has been used for a number of leagues since the first in 1891. For the reserve competitions of the same name, see here.
Scottish Union Formed in 1906, for the first few seasons this was arguably the top league outwith the Scottish League, until its gradual decline after 1910.
Scottish Combination Two versions have existed, the first in the 1890s and early 1900s was regarded as the strongest outwith the Scottish League, the second in the 1930s being set-up to basically give reserve sides of Ayr United and Third Lanark a league to play in.
Scottish Federation Lasting two seasons, 1891-1893, its member clubs joined the Scottish Alliance after that league lost most of its membership to the new Scottish Second Division.
Southern League Wartime competition set-up to replace the Scottish League which had ceased in 1940.
Central League Various versions of this league existed, 1896-1898, 1903-04, 1904-05 and 1909-1921.
Dumbartonshire & District League Cross county supplementary league that encompassed Stirlingshire, Lanarkshire, Clackmannanshire and Linlithgowshire as well as the county of Dumbarton between 1901 and 1903.
Eastern Alliance Despite being formed in May 1891, this league had a very late start - the first game was on 4 March 1892. The competition was declared unfinished after its only season.
Eastern League There were several versions of this league in existence over the years; 1904-1907, 1912-1914, 1915-1923 and 1945-46.
East of Scotland League (1893-94) Several leagues have been called by this name, this being the first. Effectively a West Lothian affair, it ended up being incomplete.
Inter County League Cross border 'supplementary' leagues played from 1904 to 1906 and in 1916-17.
Midland League Three versions of this central-based league existed between 1891 and 1911.
North Caledonian League Amateur senior league, this has been known by a number of names since its formation in 1896 and is one of the oldest in Scotland.
Northern League One of the first leagues founded in 1891, this once strong competition had an existence that lasted until after the Great War.
Scottish Federation Semi-reserve league containing western clubs which was played in 1898-99 season.
Southern Counties League There has been six versions of this league for clubs in Dumfries and Galloway between 1897 and 1937. See HERE for information on the 1926 to 1937 version.
Southern League Border competition run by clubs excluded from the Border League in 1907-08 for not having a private ground.
South of Scotland League Replaced the pre-WW2 Southern Counties League in 1946. An earlier competition by the name was also played in 1892-93.
West of Scotland League Formed as a war-time competition in 1915, this league was to eventually form the backbone of the Scottish Third Division in 1923.
Aberdeenshire League Two leagues went by this name: the first in 1899-00, and the second which was founded in 1919 as the North Eastern League, it was renamed the Aberdeenshire League in 1921. It was also referred to as the Aberdeen & District League.
Ayrshire Championship Two competitions called as such were known to have taken place, 1896-97 and 1908-09.
Ayrshire League Three versions have been in existence. The first from 1891 to 1895 was one of the first leagues to operate in Scotland. The second version from 1900-1902 was very much a secondary affair while the third, 1909-1911, included Ayr (United) and Kilmarnock.
Banffshire League Formed in 1899, this league had a somewhat haphazard existence and would only be played if enough clubs showed interest.
Fife League  Also known as the Fifeshire League, this competition played between 1903 and 1905 was the Fife Cup organised as a league.
Fife League  This war-time combination was played during 1916-17 season.
Forfar County League Formed in January 1895 by five minor clubs, it had high hopes but it disbanded at the end of the season.
Forfarshire League Organised between 1897 and 1911, the competition was run as a knock-out competition between 1901 and 1907. It featured all the senior clubs in the county, the winners being awarded the Carry Cup (or Carrie)
Glasgow League 'Supplementary' competition existing in the 1890s and mid 1900s for Scottish League clubs plus Queen's Park.
Lanarkshire League 'Supplementary' competition which existed for a few seasons around 1900.
Midlothian League Secondary competition for lesser senior clubs, played for during 1896-97.
Renfrewshire League The only occasion a county-wide league in Renfrewshire was played was in 1894.
Stirlingshire League Run during 1893-94, this was played for by the lesser senior clubs in the county.
North Ayrshire League Starting as a knock-out in 1893, this beacame a league two years later, lasting until 1908.