Calder is a rural locality in the local government area of Waratah-Wynyard in the North West region of Tasmania. It is located about south-west of the town of Wynyard. The 2016 census determined a population of 212 for the state suburb of Calder.
The locality was named for James Erskine Calder, the Surveyor General of Tasmania between 1859 and 1870. It was gazetted as a locality in 1966.
The Inglis River forms most of the western boundary. The Calder River enters the locality in the south-east and flows north-west until it meets the Inglis River.
The C235 route (Calder Road) enters from the north-east and runs south to the centre before exiting to the east as Kellatier Road.