Aba may refer to:
Abalone (/ˈæbəloʊniː/ or /ˌæbəˈloʊniː/; via Spanish abulón, from the Rumsen language aulón) is a common name for any of a group of small to very large sea snails, marine gastropod molluscs in the family Haliotidae.
The abacus (plural abaci or abacuses), also called a counting frame, is a calculating tool that was in use in Europe, China and Russia, centuries before the adoption of the written Hindu–Arabic numeral system and is still used by merchants, traders and clerks in some parts of Eastern Europe, Russia, China and Africa.
The ABA League JTD, commonly known as the Adriatic League, is a regional professional basketball league that originally featured clubs from the former Yugoslavia (Bosnia and Herzegovina, Croatia, Macedonia, Montenegro, Serbia and Slovenia).
Abandonware is a product, typically software, ignored by its owner and manufacturer, and for which no support is available.
Abarth & C. S.p.A. is a racing car and road car maker founded by Italo-Austrian Carlo Abarth in 1949. Its logo is a shield with a stylized scorpion on a red and yellow background.
ABAP (Advanced Business Application Programming, originally Allgemeiner Berichts-Aufbereitungs-Prozessor, German for "general report creation processor") is a high-level programming language created by the German software company SAP SE.
Abahlali baseMjondolo (Zulu pronunciation: [aɓaˈɬali ɓasɛm̩dʒɔˈndɔːlo], Shack Dwellers), also known as AbM or the red shirts, is a shack-dwellers' movement in South Africa which is well known for its campaigning against evictions and for public housing.
The Hebrew term Abaddon (Hebrew: אֲבַדּוֹן, 'Ǎḇaddōn), and its Greek equivalent Apollyon (Greek: Ἀπολλύων, Apollyon), appears in the Bible as a place of destruction.