The Scottish Unofficial Championship was the top league of Scotland's best amateur rugby union clubs.

The Championship was 'unofficial' as the Scottish Rugby Union held that the sport should remain amateur and at the time did not sanction competitive games between the clubs.

[1] Numerous forms of football were played in Scotland in the years prior to the introduction of the Rugby rules which were adopted for the boys of Edinburgh Academy in the early 1850s.

The post war years saw Kelvinside and West of Scotland combine until 1950–51 whilst Musselburgh and Aberdeen GSFP were newcomers to the championship.

By 1972–73, the final season prior to the introduction of league rugby, Leith Academicals, Broughton FP and Perthshire were recognised as championship clubs.