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