Beith was the son of the Rev. Alexander Beith, D.D., and brother of Ian Hay Beith, of Stirling. He was a partner in the firm of Beith, Stevenson, & Co., export merchants of Glasgow and Manchester, and a Director of the Glasgow Chamber of Commerce.
At the 1885 general election, Beith was elected as the Member of Parliament (MP) for Glasgow Central, but at the 1886 election he lost the seat in a large swing to the Conservative Party candidate. He was returned to the House of Commons at the 1892 general election as the MP for Inverness Burghs, and held that seat until he stood down at the next election, in 1895.
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "I"
- Debretts Guide to the House of Commons 1886
- Craig, F. W. S. (1989) . British parliamentary election results 1885–1918 (2nd ed.). Chichester: Parliamentary Research Services. p. 506. ISBN 0-900178-27-2.
- Hansard 1803–2005: contributions in Parliament by Gilbert Beith
|Parliament of the United Kingdom|
| Member of Parliament for Glasgow Central
1885 – 1886
John George Alexander Baird
| Member of Parliament for Inverness Burghs
1892 – 1895
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