| 1401 structured language | 1966 | ↓⊕Other US historic | ↓⊕United States | Pedogogical language for IBM 1401 |
| ABLE | 1966 | ↓⊕Generation of JOSS II | ↓⊕United States | ICC JOSS II for the IBM 360 |
| ABSYS | 1966 | ↓⊕Horn clause | ↓⊕United Kingdom | Aberdeen system declarative language |
| ACT | 1966 | ↓⊕State transition tables | ↓⊕United Kingdom | Automated Contingency Translator |
| ADPP | 1966 | ↓⊕Other DPLs | ↓⊕United States | Navy data processing language |
| AEDNET | 1966 | ↓⊕Graph | ↓⊕United States | AED dialect for modelling networks |
| ALGAMC | 1966 | ↓⊕True ALGOL60s | ↓⊕Russian Federation | Russian Algol dialect |
| ALGEM | 1966 | ↓⊕COBOL coeval | ↓⊕Russian Federation | Economic autocode |
| ALGEM | 1966 | ↓⊕Algebraic | ↓⊕United States | Polynomials-capable list-processing |
| ALGOL C | 1966 | ↓⊕True ALGOL60s | ↓⊕United States | ALGOL 60 with extensions to permit user defined extensions |
| ALGOL W | 1966 | ↓⊕Algol Ws | ↓⊕Switzerland | Wirth and Hoare |
| ALGOL Y | 1966 | ↓⊕True ALGOL68s | ↓⊕International | First version of Algol 68 |
| ALMS | 1966 | ↓⊕Algebraic | ↓⊕United States | Interactive algebraic system |
| ALPAKB | 1966 | ↓⊕Algebraic | ↓⊕United States | Generalised version of ALPAK |
| ALPS | 1966 | | | Interpretive algebraic language |
| AM1 | 1966 | ↓⊕Algebraic | ↓⊕Australia | Abstract Machine 1 |
| AMTRAN | 1966 | ↓⊕Arithmetic | ↓⊕United States | Automatic Mathematical Translator |
| APL | 1966 | ↓⊕Set | ↓⊕United States | Set-based list-processing language |
| APSE | 1966 | ↓⊕Differential Equations | ↓⊕United Kingdom | Simulation system |
| ARGMAT | 1966 | ↓⊕Algebraic | ↓⊕Germany | Matrix Algebra language |
| ASP-7 | 1966 | ↓⊕Map/Dictionary | ↓⊕United Kingdom | ASP for the PDP-7 |
| ATLAS LISP | 1966 | ↓⊕Lazy Evaluation LISPs | ↓⊕United Kingdom | LISP 1.5 for the ATLAS |
| AUTOMAST | 1966 | ↓⊕Algebraic | ↓⊕United States | automatic mathematical analysis and symbolic translation |
| AUTOPIT | 1966 | ↓⊕Numerical Control | ↓⊕Germany | |
| BATCH | 1966 | | | |
| BCL | 1966 | ↓⊕Other DPLs | ↓⊕United Kingdom | Commercial language for the Atlas |
| BEMAT | 1966 | ↓⊕Matrix | ↓⊕Germany | Matrix Algebra language |
| BHSL | 1966 | ↓⊕Analog | ↓⊕United States | Basic HYTRAN Simulation Language |
| Burroughs Assembler | 1966 | ↓⊕Symbolic assemblers | ↓⊕United States | |
| C-10 | 1966 | ↓⊕Flat DB | ↓⊕United States | Improved version of COLINGO |
| CAM | 1966 | ↓⊕Gestalt programming | ↓⊕United States | Project-based AED |
| CAPS | 1966 | ↓⊕CASE languages | ↓⊕United Kingdom | CASE language |
| CATO | 1966 | ↓⊕CAI languages | ↓⊕United States | |
| CCL | 1966 | ↓⊕Ad hoc query languages | ↓⊕United States | Querying language |
| CEA et al | 1966 | ↓⊕Algebraic | ↓⊕France | |
| Chingari conversational APT | 1966 | ↓⊕Numerical Control | ↓⊕United States | Conversational APT |
| CIDER | 1966 | | ↓⊕Australia | |
| Colin conversational language | 1966 | ↓⊕Arithmetic | ↓⊕United Kingdom | |
| COMPL | 1966 | ↓⊕COBOL coeval | ↓⊕United Kingdom | |
| COMPUTEST II-D | 1966 | ↓⊕CAI languages | ↓⊕United States | CAI and interviewing language |
| Conversational FORTRAN V | 1966 | ↓⊕Non Standard FIV | ↓⊕United States | |
| CONVERT | 1966 | ↓⊕List | ↓⊕United States | String processing language hybrid of COMIT and LISP |
| COPAL-66 | 1966 | ↓⊕COBOL coeval | | |
| CORAL 66 | 1966 | ↓⊕Other UK historic languages | ↓⊕United Kingdom | Realtime English military language |
| CourseWriter | 1966 | ↓⊕CAI languages | ↓⊕United States | CAI Language |
| Cramer and Strauss hybrid oriented language | 1966 | ↓⊕External systems control | ↓⊕United States | |
| CRESTS | 1966 | ↓⊕Decision tables | ↓⊕United Kingdom | Courtaulds Rapid Extract, Sort and Tabulate System |
| CSL | 1966 | ↓⊕Activity scanning | ↓⊕United Kingdom | Control and Simulation Language |
| CSL 2 | 1966 | ↓⊕Activity scanning | ↓⊕United Kingdom | Version 2 of CSL |
| CUCH | 1966 | ↓⊕Lazy Evaluation FPs | ↓⊕United States | |
| DAC-I | 1966 | ↓⊕2d shape | ↓⊕United States | GM Design system |
| DATAN | 1966 | ↓⊕Optimisation and LP | ↓⊕United States | |
| Desktop Calculator Formac | 1966 | ↓⊕Formulaic | ↓⊕United States | |
| Detab-66 | 1966 | ↓⊕Decision tables | ↓⊕United States | |
| DIALOG | 1966 | ↓⊕Generation of JOSS I | ↓⊕United States | Interactive math using graphics tablet |
| DIAMAG | 1966 | ↓⊕True ALGOL60s | ↓⊕International | interactive extension of ALGOL |
| DIAN | 1966 | ↓⊕2d shape | ↓⊕United States | Simulation language |
| Dijkstra's guarded command language | 1966 | ↓⊕Pascals | ↓⊕Netherlands | |
| DIMATE | 1966 | ↓⊕External systems testing | ↓⊕United States | |
| DL/I | 1966 | ↓⊕Flat DB | ↓⊕United States | Data Language/I |
| DLI | 1966 | ↓⊕3d shape | ↓⊕United States | 3d CAD system |
| DMALGOL | 1966 | ↓⊕True ALGOL60s | ↓⊕United States | ALGOL with data extensions |
| DOD Cobol | 1966 | ↓⊕COBOL-61 | ↓⊕United States | UNIVAC version of DoD mandated COBOL |
| EASL | 1966 | ↓⊕Expression oriented | ↓⊕United States | continuous simulation language |
| ECL | 1966 | ↓⊕Command systems | | Commmand language for UNIVAC |
| ECSL | 1966 | ↓⊕Activity scanning | ↓⊕United Kingdom | Extended Continuous Simulation Language |
| EPL | 1966 | ↓⊕IBM PL/Is | ↓⊕United States | Early PL/1 |
| ESI | 1966 | ↓⊕Generation of JOSS I | ↓⊕United States | Engineering and Scientific Interpreter |
| EXCHLF | 1966 | ↓⊕2G Autocodes | ↓⊕United Kingdom | Extension of CHLF3 for ATLAS |
| FAMOUS | 1966 | ↓⊕Algebraic | ↓⊕United States | Algebraic system |
| FILETAB | 1966 | ↓⊕Decision tables | ↓⊕United Kingdom | Automatic FILE TABulator |
| FIND | 1966 | | | |
| FLIP | 1966 | ↓⊕List | ↓⊕United States | Format List Processor |
| FMPS | 1966 | ↓⊕Non Standard FIV | ↓⊕United States | |
| FORDESK | 1966 | ↓⊕Fortran I-III Variants | ↓⊕Australia | Interactive FORTRAN II |
| FORTRAN 66 | 1966 | ↓⊕FORTRAN 66 standard | ↓⊕United States | |
| FORTRAN V | 1966 | ↓⊕Non Standard FIV | ↓⊕United States | Univac super-Fortran for the 1108 |
| FSL | 1966 | ↓⊕Grammar and Syntax-oriented | ↓⊕United States | |
| GAMMA | 1966 | ↓⊕Decision tables | ↓⊕United States | Bonner and Moore Matrix Generator language |
| GAMMA 3 | 1966 | ↓⊕Decision tables | ↓⊕United States | Matrix Generator and report writer |
| GDC MIDAS | 1966 | ↓⊕Expression oriented | ↓⊕United States | |
| Gear maths system | 1966 | ↓⊕Algebraic | | Differential equation system |
| GENDA | 1966 | ↓⊕2d shape | | |
| GERT | 1966 | ↓⊕Event scheduling | ↓⊕United States | Graphical simulation system |
| GIM-I | 1966 | ↓⊕Ad hoc query languages | ↓⊕United States | Information retrieval language |
| GIS | 1966 | ↓⊕Flat DB | ↓⊕United States | General Information Store |
| Glypnir | 1966 | ↓⊕Other Algol 60s | ↓⊕United States | Parallel ALGOL |
| GO-GO | 1966 | | | |
| GRASP | 1966 | ↓⊕2d shape | ↓⊕United States | GRAphic Service Program |
| GSS | 1966 | ↓⊕Multiline | ↓⊕United States | Lincoln Lab Graphical Systems Services |
| HEPL PL/I | 1966 | ↓⊕Other PL/Is | ↓⊕United States | |
| IBMAP | 1966 | ↓⊕Macroassemblers | ↓⊕United States | Bell Labs macro assembler |
| IFAPT | 1966 | ↓⊕Numerical Control | ↓⊕Canada | Canadian adaptation of APT |
| IMP | 1966 | ↓⊕3G Autocodes | ↓⊕United Kingdom | IMProved Autocode |
| ISIS | 1966 | ↓⊕Generation of JOSS I | ↓⊕United States | JOSS II dialect |
| ISM | 1966 | ↓⊕Algebraic | ↓⊕United States | Symbol manipulation language |
| ISWIM | 1966 | ↓⊕Other lambda | ↓⊕United Kingdom | Landin's paper language |
| IVTRAN | 1966 | ↓⊕Non Standard FIV | ↓⊕United States | Parallel FORTRAN |
| JFLIP | 1966 | ↓⊕Non Standard FIV | ↓⊕United States | FORTRAN Language with Interval Preprocessor |
| KALDAS | 1966 | ↓⊕Analog | ↓⊕United Kingdom | |
| LEANS | 1966 | ↓⊕Differential Equations | ↓⊕United States | Lehigh Pactolus |
| LECOM | 1966 | ↓⊕List | ↓⊕United States | LeHigh COMIT |
| LLS | 1966 | | ↓⊕Russian Federation | |
| LPG | 1966 | ↓⊕CASE languages | ↓⊕Germany | |
| LUCIFER | 1966 | ↓⊕Experiment control and recording | ↓⊕United States | Text manipulation system for experimental results |
| LYRIC | 1966 | ↓⊕CAI languages | ↓⊕United States | |
| MACLISP | 1966 | ↓⊕Lazy Evaluation LISPs | ↓⊕United States | |
| MADCAP IV | 1966 | ↓⊕Multiline | ↓⊕United States | 2d maths-oriented system |
| MANAGE | 1966 | ↓⊕Ad hoc query languages | ↓⊕United States | |
| MANIP | 1966 | ↓⊕Algebraic | ↓⊕United States | A set of FORTRAN programs to manipulate expressions. |
| MAP | 1966 | ↓⊕Generation of JOSS I | ↓⊕United States | Mathematical Analysis Program. |
| MARK III | 1966 | ↓⊕Ad hoc query languages | ↓⊕United States | |
| Markstran | 1966 | | ↓⊕United States | Paper language for the table driven compiler project |
| MATH/360 | 1966 | ↓⊕Generation of JOSS II | | |
| META 5 | 1966 | ↓⊕Grammar and Syntax-oriented | ↓⊕United States | |
| MUSICOMP | 1966 | ↓⊕Sound-Synthesis | ↓⊕United States | |
| MUSIGOL | 1966 | ↓⊕Sound-Synthesis | ↓⊕United States | Musical composition language |
| OCAL | 1966 | ↓⊕Patterns | ↓⊕United States | Pattern matching alnguage for cryptographic analysis |
| OLC | 1966 | ↓⊕Arithmetic | ↓⊕United States | UCSB students |
| PIFOR | 1966 | ↓⊕Non Standard FIV | ↓⊕United States | |
| PILOT | 1966 | | | |
| PL/ACME | 1966 | ↓⊕Other PL/Is | ↓⊕United States | PL/I dialect for medical applications |
| PLASMA | 1966 | | ↓⊕United States | |
| PM | 1966 | ↓⊕Algebraic | ↓⊕United States | Polynomial Manipulations |
| Pollack Sterling and Walton | 1966 | ↓⊕Individual | | |
| POP-1 | 1966 | ↓⊕Stack | ↓⊕United Kingdom | |
| PRO | 1966 | ↓⊕Lines | ↓⊕United States | |
| PROSPRO | 1966 | | ↓⊕United States | IBM process control language |
| PSYCO | 1966 | ↓⊕Grammar and Syntax-oriented | ↓⊕United States | Princeton SYntax COmpiler |
| QUILL | 1966 | ↓⊕Text analysis | ↓⊕Canada | |
| REFCO III | 1966 | ↓⊕List | ↓⊕United States | Reference counting list processing system |
| REPL | 1966 | ↓⊕Multics PL/Is | ↓⊕United States | Restricted EPL |
| RSS | 1966 | ↓⊕Flat DB | | |
| SAAL | 1966 | ↓⊕Symbolic assemblers | ↓⊕United States | Univac assembler |
| SAM | 1966 | ↓⊕Expression oriented | ↓⊕United Kingdom | Continuous Simulation Language |
| SCOOP | 1966 | ↓⊕2d shape | ↓⊕United States | Graphics system for CalComp |
| SDS Fortran | 1966 | ↓⊕Non Standard FIV | ↓⊕United States | |
| SERIES | 1966 | ↓⊕Flat DB | ↓⊕United States | |
| SIMSCRIPT II | 1966 | ↓⊕Event scheduling | ↓⊕United States | Simulations language |
| Sketchpad III | 1966 | ↓⊕3d shape | ↓⊕United States | 3d constraint-based drawing language |
| SLP | 1966 | ↓⊕List | ↓⊕United Kingdom | simple list processing |
| SPLINTER | 1966 | ↓⊕Other PL/Is | ↓⊕United States | Scientific PL/I Interpreter |
| System/360 Macro-Assembler | 1966 | ↓⊕Macroassemblers | ↓⊕United States | Macroassembler for the S/360 |
| TAB II | 1966 | ↓⊕Flat DB | ↓⊕United States | |
| TAB40 | 1966 | ↓⊕Decision tables | ↓⊕United States | Decision table language |
| TELCOMP | 1966 | ↓⊕Generation of JOSS II | ↓⊕United States | Joss variant for remote computing |
| TELSIM | 1966 | ↓⊕Expression oriented | ↓⊕United States | Simulation language |
| TEXTPAC | 1966 | ↓⊕Substrings | ↓⊕United States | Text handling language |
| TRANQUIL | 1966 | ↓⊕Set | ↓⊕United States | Set language for ALGOL |
| TRIGMAN | 1966 | ↓⊕Algebraic | ↓⊕United States | celestial mathematics system |
| UAIDE | 1966 | ↓⊕2d shape | ↓⊕United States | Graphics system at NASA |
| UMIST | 1966 | ↓⊕Macros | ↓⊕United States | Michigan TRAC |
| UNIVAC 1108 ALGOL | 1966 | ↓⊕True ALGOL60s | ↓⊕Norway | |
| UNIVAC 1108 APT III | 1966 | ↓⊕Numerical Control | ↓⊕United States | |
| UNIVAC 1108 SORT/MERGE | 1966 | ↓⊕Sorting and editing systems | ↓⊕United States | |
| UNIVAC GPSS | 1966 | ↓⊕Event scheduling | ↓⊕United States | |
| UP.L6 | 1966 | ↓⊕List | ↓⊕United States | |
| UTOL | 1966 | ↓⊕Intermediate languages and VMs | ↓⊕United States | |
| VICAR | 1966 | ↓⊕AV-Control | ↓⊕United States | NASA image manipulation language |
| WATFOR | 1966 | ↓⊕FORTRAN IV standard | ↓⊕Canada | WATerloo FORtran |
| Wisconsin Algol | 1966 | ↓⊕True ALGOL60s | ↓⊕United States | |
| XALT | 1966 | | ↓⊕United Kingdom | |