Anabasis (from Greek ana = "upward", bainein = "to step or march") is an expedition from a coastline into the interior of a country. Anabase and Anabasis may also refer to:

• Anabasis Alexandri (Anabasis of Alexander), a history of the campaigns of Alexander the Great by Greek historian Arrian
• Anabasis (Xenophon), a history of the expedition of Cyrus the Younger by Greek writer Xenophon
• Siberian Anabasis, a literary name for the Czechoslovak Legions' transit through Siberia during the Russian Civil War, in reference to the epic of Xenophon

• "Anabase [fr]", a 1924 poem by Saint-John Perse
• "Anabasis", a 1930 translation of Saint-John Perse's poem by T. S. Eliot
• "Anabasis", poem by Paul Celan, published 1963 in Die Niemandsrose
• Anabasis, a 1994 novel by Ellen Gilchrist
• Anabasis, a novel of Hellenistic Afghanistan and India by Geoffrey Storey

• Anabasis, a fantasy music act on Waerloga Records.
• The Anabasis, an American progressive metal band featuring Ryo Okumoto.
• "Anabasis (Xenophontis)", a song from the album Killing with a Smile by Australian band Parkway Drive.
• "Anabasis", second track on Anastasis, the eighth studio album by Dead Can Dance, released 2012.

• Anabasis (moth), a genus of snout moths in the family Pyralidae
• Anabasis (plant), a genus of desert shrubs in family Chenopodioideae
• Anabatic wind, a wind which blows up a steep slope or mountain side

• Anabasii, couriers of antiquity
• Katabasis, a journey to the underworld