Hay is a masculine given name and nickname. It may refer to:
Hay Frederick Donaldson (1856–1916), Australia-born English mechanical engineer and British Army brigadier-general Hay MacDowall (died 1809), British Army lieutenant general, General Officer Commanding, Ceylon Hay Millar (1883–1944), Canadian ice hockey player Hay Petrie (1895–1948), Scottish actor Hay Plumb (1883–1960), English actor and film director born Edward Hay-Plumb Hay Wilson (died 1925), Anglican priest, Dean of Moray, Ross and Caithness