Chalvey is a former village, which is now a suburb of Slough, in the unitary authority of Slough in Berkshire, England. It was transferred to Berkshire from Buckinghamshire in 1974.It was first recorded in 1217 by an Old English word meaning "Calf Island", from Cealf meaning calf. As the name implies, Chalvey lies low on the plain of the River Thames, and there may have been enough of a rise for an island to stand above the slough from which the later town takes its name.