Old Spierians RFC was an amateur rugby union club in Beith, North Ayrshire, Scotland.

Old Spierians RFC was formed when former pupils of the school team wished to continue playing the sport after their graduation.

[5] The Old Spierians rugby union side of the former pupils of Spier's School came into existence in 1890.

[2] The team is noted in the Glasgow Herald newspaper of Monday 26 February 1894 as playing Dalry at Beith.

[6] The team is also noted in the Edinburgh Evening News newspaper of Tuesday 25 September 1894 as playing the then current Spier's School at rugby.

[8] By 1904, one of the Old Speirians players was selected for the South-West district in an International Trial match at Aberdeen.

[1] However - given that he lived until he was 93 and passed away in 1973[1] - the act of founding a rugby club in 1890 for former school pupils, when he would have been aged only 10 years old, does seems unlikely.

On 1 April 1922 they entered a Sevens tournament hosted by Kelvinside Academicals at Balgray, Glasgow.

G. Bray was selected for West Counties against North of Scotland in the Dunfermline-based match of 10 November 1928.

In 1960 the club made a decision to become an 'open' side; in other words they no longer restricted their catchment to the former pupils of Spier's School.

[20] With the closure of the schools providing much of their rugby base, the former pupil sides Old Spierians and Dalry HSFP merged to form Garnock RFC; to emphasis that the new side would provide a gateway to later rugby union for the new Garnock Academy graduates.