A type

A type or type A may refer to:

Science

 * A-type asteroid, a type of relatively uncommon inner-belt asteroids
 * A type blood, a type in the ABO blood group system
 * A-type inclusion, a type of cell inclusion
 * A-type potassium channel, a type of voltage-gated potassium channel
 * A type proanthocyanidin, a specific type of flavonoids
 * A-type star, a class of stars
 * Type A climate, a type in the Köppen climate classification
 * Type A flu, a type of influenza virus
 * Type A evaluation of uncertainty, an uncertainty in measurement that can be inferred, for example, from repeated measurement
 * Type A personality, a personality type in the Type A and Type B personality theory
 * Hemophilia type A, a type of haemophilia
 * A-type granite a type of granite rock
 * Adenosine receptor

Technology

 * Type A Dolby Noise Reduction, a type of Dolby noise-reduction system
 * Type A plug (see also NEMA connector)
 * Type A submarine, a class of submarines in the Imperial Japanese Navy which served during the Second World War
 * Renault A-Type engine, a straight-4 automobile engine
 * Toyota Type A engine
 * Vauxhall A-Type, a car manufactured by Vauxhall Motors from 1908 to 1915
 * A type Adelaide tram

Entertainment

 * Type A (label), a music label that for example produced the 2004 album What Doesn't Kill You... by Candiria
 * Type A (artist collective), a pair of New York-based artists named Adam Ames and Andrew Bordwin