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

See also[edit]

• Calendar - (chronological system or book)
• Calender - (roller system)
• Callander - (Town in Scotland)
• Callender (disambiguation)
• Colander (kitchen utensil)
• Qalandar (disambiguation)