Cephissus (ancient Greek: Κήφισσος; /sɪˈfɪsəs/), Cephisus, Kephisos, or Kifisos may refer to:

Look up Cephisus in Wiktionary, the free dictionary.

• Cephissus (Argolis), a river in Argolis, a tributary of the Inachus River
• Cephissus (Boeotia), a river in northern Boeotia
• Cephissus (Athenian plain), a river in Attica flowing through the Athenian plain
• Cephissus (Eleusis), a tributary of the Saronic Gulf from the Eleusinian plain
• Cephissus (Salamis), a river on Salamis Island

• Cephissus (mythology), a man changed into a sea monster by Apollo
• Cephissus, a Martian canal, per List of Martian canals
• Battle of the Cephissus, 15 March 1311 conflict between the Frankish Greek forces of Walter V of Brienne and the mercenaries of the Catalan Company
• Cephisus (spittlebug), a genus of insects in the family Aphrophoridae

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