Glyn was a younger son of George Glyn, 1st Baron Wolverton, and his first wife Marianne, daughter of Pascoe Grenfell. George Glyn, 2nd Baron Wolverton, and Vice-Admiral the Hon. Henry Carr Glyn were his elder brothers while the Right Reverend the Hon. Edward Glyn, Bishop of Peterborough, was his younger brother. He was elected at the 1880 general election as the Member of Parliament (MP) for Shaftesbury, and held the seat until the constituency was abolished at the 1885 general election.
Glyn married Fanny, daughter of Adolphe Marescaux, in 1868. He died on 26 February 1916, aged 80.
- Hansard 1803–2005: contributions in Parliament by Sidney Glyn
|Parliament of the United Kingdom|
Vere Fane Benett-Stanford
|Member of Parliament for Shaftesbury