Callendar

Callendar is a title of Scottish nobility and a surname. It may refer to:


 * Earl of Callendar
 * Callendar House, Falkirk
 * Guy Stewart Callendar (1898 – 1964), English steam engineer and inventor and son of Hugh Longbourne Callendar
 * Callendar effect
 * Hugh Longbourne Callendar (1863 – 1930), British physicist and father of Guy Stewart Callendar