| Honorific-Prefix: | Sir |
| Allen Montgomery Lewis | |
| Order: | 1st |
| Office: | Governor-General of Saint Lucia |
| Term Start: | 22 February 1979 |
| Term End: | 19 June 1980 |
| Predecessor: | Position established Himself (as governor) |
| Successor: | Boswell Williams |
| Monarch2: | Elizabeth II |
| Term Start2: | 13 December 1982 |
| Term End2: | 30 April 1987 |
| Predecessor2: | Boswell Williams |
| Successor2: | Stanislaus A. James |
| Office3: | Governor of Saint Lucia |
| Term Start3: | 1974 |
| Term End3: | 1979 |
| Predecessor3: | Ira Marcus Simmons |
| Successor3: | Position abolished Himself (as governor-general) |
| Birth Date: | 26 October 1909 |
| Relations: | Vaughan Lewis (son) W. Arthur Lewis (brother) |
| Alma Mater: | Saint Mary's College |
Sir Allen Montgomery Lewis (26 October 1909 – 18 February 1993) was a Saint Lucian barrister and public servant who twice served as the country's Governor-General.[1]
Lewis was born in Castries, St Lucia, where he was educated at the Castries Anglican Infant and Primary Schools and Saint Mary's College. He then studied law at London University and the Middle Temple.
He became a member of Castries City Council in 1941, acting as Chairman six times. He was one of the founders and the first president of the Saint Lucia Labour Party in 1950. Before his appointments to the viceregal post, Sir Allen sat on the legislative council (1943–1951) and was a senator in the Federal Parliament of the West Indies Federation (1958–1959).[2]
Lewis had a distinguished legal career alongside his political accomplishments; he was a judge on the Jamaican Court of Appeal (1962–1967) and the first Chief Justice of the West Indies Associated States Supreme Court (1967–1972). In 1975 he became Chancellor of the University of the West Indies.
In 1972, he returned to Saint Lucia and spent two years establishing a National Development Corporation to develop the economy of the island, after which he was appointed Governor of Saint Lucia, the Queen's representative. When St Lucia gained independence in 1979, Lewis served twice in the equivalent role as Governor-General of Saint Lucia (1979–1980 and 1982–1987).
His brother, W. Arthur Lewis, won the Nobel Memorial Prize in Economics for his work on developing countries and the "Lewis turning point".[3]