Sydney Hughes Greenstreet (27 December 1879 – 18 January 1954) was a British actor. While he did not work in films until the age of 62, he had a run of significant films in a Hollywood career lasting for under a decade. He is best remembered for his Warner Bros. films with Humphrey Bogart and Peter Lorre, which include The Maltese Falcon (1941), Casablanca (1942), and Passage to Marseille (1944). He became a naturalized United States citizen in 1925. He portrayed Nero Wolfe on radio from 1950 to 1951.
Greenstreet was born in Sandwich, Kent, the son of Ann (née Baker) and John Jarvis Greenstreet, a tanner. He had seven siblings. He left home at the age of 18 to make his fortune as a Ceylon tea planter, but drought forced him out of business. He began managing a brewery and, to escape boredom, took acting lessons.
Greenstreet's stage debut was as a murderer in a 1902 production of a Sherlock Holmes story at the Marina Theatre, Ramsgate, Kent. He toured Britain with Ben Greet's Shakespearean company, and in 1905, he made his New York City debut in Everyman. Thereafter he appeared in such plays as a revival of As You Like It (1914). Greenstreet appeared in numerous plays in Britain and America, working through most of the 1930s with Alfred Lunt and Lynn Fontanne at the Theatre Guild. Throughout his stage career, his parts ranged from musical comedy to Shakespeare, and years of such versatile acting on two continents led to many offers to appear in films. He refused until he was 62.