MCA can stand for:

• Malaysian Chinese Association — Political party in Malaysia.
• Maritime and Coastguard Agency — Agency of the United Kingdom Government.
• Master of Computer Applications — Three-year Professional Master's degree in Computer Science awarded in India.
• Maximum credible accident — a concept used in risk management.
• MCA (rapper) — Rapper in the group, The Beastie Boys.
• Micro Channel architecture — Type of computer bus.
• Monochloroacetic Acid — Carboxylic acid, manufactured by chlorinating acetic acid.
• MultiCultural Aotearoa — a New Zealand political action group.
• Mumbai Cricket Association — Ruling body for cricket in Mumbai.
• Music Corporation of America — Music booking company and record label.