Stanley de Zoysa (27 June 1907 – 10 December 1970) was a Sri Lankan businessmen and politician.

Sydney de Zoysa was educated at the Royal College, Colombo, he went into business and became a prominent businessmen.

Joining the Sri Lanka Freedom Party, he contest the 1956 general election from the Ja-Ela electorate and was elected to parliament defeating the United National Party candidate G. J. Paris Perera.

He was forced to resign on 23 November 1959 following the arrest of his brother F. R. de Zoysa and his former bodyguard Ossie Corea as a result of the investigation into the Bandaranaike assassination.

Sydney de Zoysa was subsequently appointed Minister of the Interior in 1959 and served till 1960 when parliament was dissolved for elections.