Sir William James Allen (15 October 1866 – 20 December 1947) was a Northern Irish unionist politician.
He was elected to the British House of Commons at a by-election in 1917, as an Irish Unionist Party Member of Parliament (MP) for North Armagh, and retained his seat at the 1918 general election. The constituency was abolished for the 1922 general election, when he was re-elected as a member of the new Ulster Unionist Party for the new Armagh constituency.
He died in 1947 two weeks after being hit by a lorry as he left a tram on the Lisburn Road, Belfast on 5 December. He was 81 and the second oldest MP in the House of Commons. Sir William was buried in Lurgan. He was survived by his second wife Lillah Irene, Lady Allen.
| Parliament of the United Kingdom | ||
|---|---|---|
| Preceded by Sir William Moore |
Member of Parliament for North Armagh 1917–1922 |
Succeeded by Himself as MP for Armagh |
| New constituency made from three existing constituencies
|
Member of Parliament for Armagh 1922–1947 |
Succeeded by James Richard Edwards Harden |
| Non-profit organization positions | ||
| Preceded by William Lyons |
Sovereign Grand Master of the Royal Black Preceptory 1924–1947 |
Succeeded by Sir Norman Stronge |