Royal Leamington Spa, commonly known as Leamington Spa or simply Leamington /ˈlɛmɪŋtən/ (listen), is a spa town in Warwickshire, England. Originally a small village called Leamington Priors, it grew into a spa town in the 18th century following the popularisation of its water which was reputed to have medicinal qualities. In the 19th century, the town experienced one of the most rapid expansions in England. It is named after the River Leam, which flows through the town.
The town contains especially fine ensembles of Regency architecture, particularly in parts of the Parade, Clarendon Square and Lansdowne Circus.
In the 2011 census Leamington had a population of 55,733. Leamington is contiguous with the neighbouring towns of Warwick and Whitnash, which together form a continuous urban area, in 2011 the urban area had a population of 95,172.