Leicester Secular Society is the world's oldest Secular Society. It meets at its headquarters, the Leicester Secular Hall in the centre of Leicester, England, at 75 Humberstone Gate.

Leicester is a city, unitary authority area, unparished area and the county town of Leicestershire in the East Midlands of England. It is the largest city in the East Midlands with a population of 373,399 in 2022. The greater Leicester urban area had a population of 559,017 in 2021, making it the 11th most populous in England, and the 13th most populous in the United Kingdom. A 2023 report ranked Leicester 16th out of the 50 largest UK cities on a range of economic measures, and the first of seven East Midlands cities.