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
 - Hugh Longbourne Callendar (1863 – 1930), British physicist and father of Guy Stewart Callendar
 
See also
- Calendar - (chronological system or book)
 - Calender - (roller system)
 - Callander - (Town in Scotland)
 - Callender (disambiguation)
 - Colander (kitchen utensil)
 - Qalandar (disambiguation)