TCA

TCA may refer to:

In economics:
 * True cost accounting

In education:
 * The Classical Academy, Colorado Springs, US

In finance:
 * Transaction cost analysis

In chemistry:
 * Trichloroacetic acid, chemical used to precipitate protein in serum
 * Tricyclic antidepressant
 * 2,4,6-Trichloroanisole, cause of cork taint in wine

In biochemistry:
 * Citric acid cycle, or tricarboxylic acid cycle, a pathway in cellular metabolism

In associations:
 * Taiwan Constitution Association, a political party in Taiwan
 * Tekeyan Armenian Cultural Association, a network of Armenian cultural organisations
 * Television Critics Association
 * The Consulting Association
 * Total Community Action
 * Trans-Canada Air Lines, predecessor to Air Canada
 * Taiwanese Cultural Association
 * Train Collectors Association
 * Transportes Carga Aérea, a defunct Brazilian airline
 * Trinity Christian Academy (Deltona, Florida), US
 * Trinity Christian Academy (Jackson, Tennessee), US

Other uses:
 * Terminal Control Area, a volume of controlled airspace
 * The Competition Authority (Ireland)
 * Topology change acknowledgement, a type of Bridge Protocol Data Unit used by the Spanning Tree Protocol (STP)
 * Total cost of acquisition
 * Toxin complex a, Tca, an insecticidal toxin complex
 * The Canadian Amateur, radio amateur magazine
 * Traumatic cardiac arrest, due to trauma
 * Tribune Content Agency, a syndication company owned by Tribune Publishing
 * Triple Crown of Acting is a term used in the American entertainment industry to describe actors who have won a competitive Academy Award, Emmy Award, and Tony Award in the acting categories.