Sydney Hughes Greenstreet (27 December 1879 - 18 January 1954) was an English actor. He is best known for his Warner Bros. films with Humphrey Bogart and Peter Lorre, which include The Maltese Falcon (1941) and Casablanca (1942).
Greenstreet was born in Sandwich, Kent, England, the son of a leather merchant, and had seven siblings. He left home at age 18 to make his fortune as a Ceylon tea planter, but drought forced him out of business and back to England. He managed a brewery and, to escape boredom, took acting lessons.
His stage debut was as a murderer called Craigen in a 1902 production of a Sherlock Holmes entry by Sir Arthur Conan Doyle at the Marina Theatre in Ramsgate, Kent. He toured England with Ben Greet's Shakespearean company, and in 1905, he made his New York debut. Thereafter he appeared in such plays as a revival of As You Like It in 1916 with revered actress Margaret Anglin.
Greenstreet appeared in numerous plays in England 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.