Saint Laurence's Church is one of three Church of England parish churches in the benefice of Upton-cum-Chalvey, and is the oldest building in the borough of Slough, in Berkshire, England. In the 12th century the wooden parish church of Upton was replaced with a flint building. The tower and outside walls of the Norman building form part of the present church. Several of the walls are built of pudding stone. Two other Norman features survive: the ancient baptismal font and a piscina. In the English Reformation many of the ancient decorations were mutilated. A 13th-century Italian allegorical image of the Trinity – God Father, Son and Holy Spirit – survived and was reassembled in the restoration of the church.