Audax is a Latin adjective meaning "bold, daring" and may refer to:
Media Audax Groep, a Dutch media and retail company
Sport Cycling Audax (cycling), long-distance endurance bicycle rides Audax Australia, an organisation that runs long distance randonnee cycling events in Australia and New Zealand Audax UK, British cycling club that oversees long-distance cycling in the United Kingdom
Football Audax Italiano, a Chilean football club based in the city of Santiago Audax Rio de Janeiro Esporte Clube, a Brazilian football club based in the city of São João de Meriti Grêmio Osasco Audax Esporte Clube, a Brazilian football club based in the city of São Paulo
Transport Hawker Audax, British, 1930s military aircraft Rootes Audax, a family of cars made by the British Rootes Group
People Audax, one of the assassins of the Lusitanian leader Viriathus during the Roman Conquest of Hispania: see Audax, Ditalcus and Minurus St. Audax, a 3rd-century saint who was supposedly martyred with Victoria and Anatolia Audax, an archbishop of Tarragona (Spain) c. 633 who assisted to the Fourth Council of Toledo Audax Minor (1887–1979), racing columnist for The New Yorker Audax (grammarian), a grammarian of the 5th/6th centuries
Companies Audax, listed energy company based in Spain