Sidera can be:
Sidera Sidera, a genus of fungi Seleucia Sidera, ancient city in the northern part of Pisidia, Anatolia Cosmica Sidera, initial name for Galilean moons Sidera Lodoicea, name given by the astronomer Giovanni Domenico Cassini to the four moons of Saturn Quem terra, pontus, sidera, ancient hymn in honour of the Blessed Virgin Sidera, a neighbourhood in Chalandri Sidera Networks, U.S. telecom company
Sideras Loukas Sideras, drummer of the Greek progressive rock band Aphrodite's Child Sideras, a village in Greece
See also Sidus (disambiguation); "sidus" is the singular for the Latin "sidera"