Aba can be:

• For the abbreviation or acronym ABA, see ABA
• Aba, Okayama - village in Japan
• Aba, Nigeria - city in Nigeria
• Aba, Sichuan - city in Sichuan, China
• A form of altazimuth instrument, invented by, and called after, Antoine d'Abbadie
• a rough homespun manufactured in Bulgaria
• a long coarse shirt worn by the Bedouin Arabs.