Sir Reginald Henry Cox, 1st Baronet, DL (30 December 1865 – 27 March 1922) was an English banker.
He was a Senior Partner at Cox & Co. and an agent for the British Army.
He was created a baronet of Old Windsor in the County of Berkshire in the 1921 New Year's Honours.
He died at the age of 56 without surviving children, and the baronetcy thus became extinct after only just over a year.
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