Israel Sieff, Baron Sieff

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Israel Moses Sieff, Baron Sieff (4 May 1889 – 14 February 1972) was a British businessman.

He was educated at Manchester Grammar School and Manchester University. One of the theatres at the Manchester Grammar School is named in his honour.

Sieff was chairman of the British retailer, Marks & Spencer from 1964 to 1967. In 1966 he had been created a life peer as Baron Sieff, of Brimpton in the Royal County of Berkshire.

He was president of the Political and Economic Planning think-tank from its foundation in 1931, and chairman until 1939.

Upon the tragic death of his son Daniel Sieff --- and with the financial support of his business partners and relatives by marriage, the Marks and Sacher families --- Israel Sieff endowed the 1934 creation, by Chaim Weizmann, of the Daniel Sieff Research Institute in Rehovot, present-day Israel. Renamed the Weizmann Institute of Science in 1949 with the Sieff family's consent, it is presently Israel's premier research university in the natural sciences.