The Foster baronetcy, of Bloomsbury in the County of London, was created in the Baronetage of the United Kingdom on 5 February 1930 for the university administrator and educationalist Gregory Foster. He was provost of University College London between 1907 and 1929 and vice-chancellor of the University of London between 1928 and 1930.

Foster baronets, of Bloomsbury (1930) Sir (Thomas) Gregory Foster, 1st Baronet (1866–1931) Sir Thomas Saxby Gregory Foster, 2nd Baronet (1899–1957) Sir John Gregory Foster, 3rd Baronet (1927–2006) Sir Saxby Gregory Foster, 4th Baronet (born 1957).

The heir apparent to the baronetcy is Thomas James Gregory Foster (born 1991), son of the 4th Baronet.

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