TCA may stand for:

• 2,4,6-trichloroanisole, cause of cork taint in wine
• Television Critics Association
• Threshold Crossing Alert
• Total Community Action
• Trans Canada Airlines
• Transaction Cost Analysis
• Tricarboxylic acid cycle (Krebs Cycle)
• Trichloroethane, organochloride solvent
• Trichloroacetic acid, chemical used to precipitate protein in serum
• Tricyclic antidepressants
• The Chosen Arena PHP, A turn based stategy game that is PHP based

TCA