AC, A.C. or Ac may refer to:
Acute radiation syndrome (ARS), also known as radiation sickness, is a collection of health effects due to exposure to high amounts of ionizing radiation over a short period of time.
The Academy Awards, also officially and popularly known as the Oscars, are a set of awards for artistic and technical merit in the film industry.
AC/DC are an Australian rock band formed in Sydney in 1973 by Scottish-born brothers Malcolm and Angus Young.
The Achaemenid Empire (; 𐎧𐏁𐏂 Xšāça (Old Persian) "The Empire" c. 550–330 BC), also called the First Persian Empire, was an ancient Iranian empire based in Western Asia founded by Cyrus the Great.
An acronym is a word or name formed as an abbreviation from the initial components of a phrase or a word, usually individual letters, as in NATO (North Atlantic Treaty Organization) or SCUBA (Self-Contained Underwater Breathing Apparatus) and sometimes syllables (as in "Benelux").
Action film is a film genre in which the protagonist or protagonists are thrust into a series of challenges that typically include violence, extended fighting, physical feats, and frantic chases.
The Academy Award for Best Picture is one of the Academy Awards (Oscars) presented annually by the Academy of Motion Picture Arts and Sciences (AMPAS) since the awards debuted in 1929. This award goes to the producers of the film and is the only category in which every member of the Academy is eligible to submit a nomination and vote on the final ballot.
An actor is a person who portrays a character in a performance (also actress; see below). The actor performs "in the flesh" in the traditional medium of the theatre or in modern media such as film, radio, and television.
Acetic acid , systematically named ethanoic acid , is a colourless liquid organic compound with the chemical formula CH3COOH (also written as CH3CO2H or C2H4O2).