St Nicolas Church is an Anglican church in the Portslade area of the English city of Brighton and Hove. It has 12th-century origins, and serves the old village of Portslade, inland from the mostly 19th-century Portslade-by-Sea area.

Portslade is a western suburb of the city of Brighton and Hove in the ceremonial county of East Sussex, England. Portslade Village, the original settlement a mile inland to the north, was built up in the 16th century. The arrival of the railway from Brighton in 1840 encouraged rapid development of the coastal area and in 1898 the southern part, formerly known as Copperas Gap, was granted urban district status and renamed Portslade-by-Sea, making it distinct from Portslade Village. After World War II the district of Mile Oak to the north was added. Today, Portslade is bisected from east to west by the old A27 road between Brighton and Worthing, each part having a distinct character.