| ALGAE | — | 1951 | — |
| Algebraic Logic Functional programming language | logic programming, functional programming | — | — |
| Algek | — | — | — |
| ALGO | — | 1961 | Bendix Corporation |
| ALGOL | structured programming, procedural programming, imperative programming | 1959 | — |
| ALGOL 58 | imperative programming, structured programming, procedural programming | — | Klaus Samelson, Heinz Rutishauser, Charles Katz, Friedrich L. Bauer, Alan Perlis, John Backus |
| ALGOL 60 | procedural programming, structured programming, imperative programming | — | Peter Naur, Adriaan van Wijngaarden, Klaus Samelson, John Backus, John McCarthy, Heinz Rutishauser, Charles Katz, Bernard Vauquois, Alan Perlis, Friedrich L. Bauer |
| ALGOL 68 | imperative programming, concurrent computing | — | Adriaan van Wijngaarden, John E. L. Peck, Cornelis H. A. Koster, Barry J. Mailloux |
| ALGOL 68C | — | 1970 | Stephen R. Bourne |
| ALGOL W | structured programming, procedural programming, imperative programming | 1966 | Tony Hoare, Niklaus Wirth |
| Alice | constraint programming, imperative programming, functional programming, concurrent computing | 2000 | Saarland University |
| Alice | — | 1995 | Carnegie Mellon University |
| Alkhawarizm | — | — | — |
| Allegro Common Lisp | object-oriented programming | — | — |
| Alma-0 | constraint programming, logic programming, imperative programming, procedural programming | 1997 | Centrum Wiskunde & Informatica |
| ALMIR-65 | — | 1965 | — |
| Alore | — | — | — |
| Alpaca | functional programming | — | — |
| Altair BASIC | — | 1975 | Bill Gates, Paul Allen |
| ALTRAN | — | 1965 | Bell Telephone Laboratories |
| Alusus | — | — | — |
| Amazon Shading Language | — | — | — |
| Amber | — | — | — |
| AmbientTalk | reflective programming, concurrent computing, prototype-based programming, object-oriented programming, event-driven programming | 2006 | — |
| AmiBlitz | — | — | — |
| Amiga Basic | — | — | Microsoft, MetaComCo |
| Amiga E | object-oriented programming | 1993 | Wouter van Oortmerssen |
| AMOS | procedural programming, imperative programming | 1990 | François Lionet |
| Ampersand | — | — | Jason Kerama |
| AMPL | declarative programming, imperative programming | 1985 | Bell Labs |
| AMPLE | — | — | — |
| Analitik | — | 1968 | Viktor Glushkov, Glushkov Institute of Cybernetics, National University «Yuri Kondratyuk Poltava Polytechnic» |
| Analytica | array programming | 1992 | — |
| AngelScript | imperative programming, procedural programming, object-oriented programming | 2003 | — |
| ANSYS Parametric Design Language | — | 1970 | — |
| Apache Ant | — | 2000 | Apache Software Foundation |
| Apache Groovy | object-oriented programming, multi-paradigm programming, imperative programming, functional programming | 2003 | Java Community Process, Apache Software Foundation |
| Apex | object-oriented programming | 2007 | Salesforce |
| APL | array programming, structured programming, functional programming, modular programming | 1966 | IBM, Lawrence M. Breed, Kenneth E. Iverson |
| APLX | — | — | — |
| Apple Dylan | — | — | — |
| AppleScript | natural-language programming | 1993 | Apple Inc. |
| Applesoft BASIC | — | 1977 | Microsoft |
| April APL | — | — | — |
| AQASM | — | 2017 | Atos SE |
| Arc | metaprogramming, procedural programming, functional programming | 2008 | Paul Graham |
| Arduino | functional programming, procedural programming | — | Massimo Banzi |
| ARexx | — | 1987 | — |