In and '''literature''':
- Ajax , 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
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- Ajax Amsterdam , professional football team of Amsterdam, The Netherlands
- Ajax (band) , from New York City
- '' Ajax (arcade Game) '', by Konami
- Ajax (horse) , a champion Australian racehorse which raced in the 1930s
- Ajax (programming) , Asynchronous JavaScript and XML for web development
- HMS ''Ajax'' , several ships of the Royal Navy
- Ajax Cleanser household cleaner
- Ajax Duckman , a character in the animated television series ''Duckman''
- Ajax, Ontario , Canada
- Ajax Records
- Ajax Kenitra , a Moroccan futsal club
- Operation Ajax , a 1953 Anglo-American covert operation to overthrow the government of Iran
- Aspen Mountain (Colorado) , alternatively called Ajax Mountain
- Ajax (Mickey Mouse) , a fictional company in Mickey Mouse cartoons; see Acme Corporation
- Ajax (aircraft) , a Russian hypersonic aircraft project based on plasma stealth technology
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