Sir Reginald Theodore Blomfield (20 December 1856–27 December 1942) was a British architect, garden designer and author.
Reginald Blomfield was born in Nymet Tracey, Devon, son of the local clergyman. He was educated at Haileybury school and at Exeter College, Oxford. His uncle, Sir Arthur Blomfield, was an architect and Blomfield followed him into the profession, training first under his uncle, then at the Royal Academy in London, where he later (1906) became Professor of Architecture.
After establishing his own practice, he designed the Menin Gate Memorial in Ypres, Flanders, the Pall Mall premises of the Carlton Club destroyed in World War 2 (rather than the current premises in St James's Street), Lambeth Bridge, works at Lady Margaret Hall, Oxford and Goldsmiths College. He became known for remodelling streets in the early 20th Century such as Regent Street in London in the 1920s  and The Headrow in Leeds from 1929. These are notable for being constructed in a uniform architectural style, and Pevsner comments on the similarity of the Leeds scheme to the earlier one in Regent Street.
In 1913 he was awarded the Gold Medal of the Royal Institute of British Architects (RIBA) and was elected to the Royal Academy in 1914.
Riddington, Peter and others, Regent Street, History and Conservation. Donald Insall Associates, London 2001.