may refer to:
- Ajax (mythology) , also known as Telamonian Ajax or Ajax the Great, a Greek hero and legendary king of Salamis who plays an important role in Homer's ''Iliad''.
- Ajax The Lesser , or Oilean Ajax, a Greek hero and legendary king of Locris who appears in Homer's ''Iliad''
- ''Ajax'' (Sophocles) , a tragedy by the Greek playwright Sophocles, whose main character is Telamonian Ajax
- AFC Ajax , an association football club from Amsterdam, The Netherlands
- Ajax America , also known as Ajax Orlando, an American soccer team from Orlando, Florida
- Ajax Cape Town , a South African association football club
- Ajax Kenitra , a Moroccan futsal (indoor football) club
- FC Ajax Lasnamäe , an Estonian football club
- Rabat Ajax , a Maltese football club
- Ajax Sportman Combinatie (ASC), a cricket and football club in Leiden, The Netherlands
- Aias Salaminas F.C. , a football club based in Salamina, Greece birthplace of Ajax the Telamonian.
- Ajax (1906 Automobile) , Aigner, Switzerland
- Ajax (1913 Automobile) , Briscoe, France
- Ajax (1914 Automobile) , Seattle, Washington, U.S.
- Ajax (1921 Automobile) , prototype, U.S.
- Ajax (automobile) , Nash Motors, 1925–1926, U.S.
- HMS ''Ajax'' , several ships of the Royal Navy
- USS ''Ajax'' , several ships of the United States
- Ajax (1860 Locomotive) , one of the eight South Devon Railway Dido Class steam locomotives, in service 1860-1884
- Ajax (1927 Locomotive) , a LMS Royal Scot Class express locomotive, in service 1927-1962
- Ajax (Disney) , a fictional company (the Disney equivalent of Looney Tunes' Acme Corporation)
- Ajax Duckman , a character in the animated television series ''Duckman''
- Martian Manhunter , a comic superhero called Ajax in Brazil and Portugal
- Ajax (comics) , the name of two fictional characters from the Marvel Universe
- Ajak , another Marvel Comics character, a member of the Eternals, sometimes known as "Ajax the Greater"
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