Plessey (disambiguation)

Plessey was a British electronics company.

It can also refer to:
 * Plessey Code, a British barcode system
 * Plessey System 250, a computer system that implements capability based addressing
 * Plessey railway station, a disused halt near Plessey village, in Northumberland
 * Plessey Woods Country Park, near Plessey village, in Northumberland