Staines-upon-Thames is a suburban town on the River Thames in the borough of Spelthorne in Surrey, England. Before 1 April 1965 it was in the historic county of Middlesex. Known to the Romans as Pontes or Ad Pontes, then as Stanes and subsequently Staines, the town officially adopted its longer current name on 20 May 2012. However the upon-Thames suffix is still often dropped in common usage.