John James Sexby VD (known as JJ Sexby) (15 July 1847 – 10 May 1924) was a British civil servant who served as the first Chief Officer for Parks for the London County Council from 1892 to 1909, and was responsible for the creation of many of London's late Victorian and Edwardian parks. He is invariably described as Lt-Col JJ Sexby, although all of his military service was in the Volunteer Force (the precursor to the Territorial Army) and Lt-Col was an honorary title as his substantive rank was that of a Major.