| T | 1982 | functional programming, imperative programming, multi-paradigm programming, metaprogramming, object-oriented programming | dynamic typing, strong typing | 1 |
| TACL | — | — | — | — |
| TADS | 1988 | prototype-based programming | inference typing, strong typing | — |
| Tcl | 1988 | event-driven programming, procedural programming, functional programming, imperative programming, multi-paradigm programming, object-oriented programming | dynamic typing | 6 |
| TclX | — | — | — | — |
| Tea | 1997 | functional programming, multi-paradigm programming, object-oriented programming | — | — |
| TECO | 1962 | — | — | — |
| TELCOMP | 1965 | — | — | 1 |
| Teml | — | — | — | — |
| TeX | 1978 | — | — | 1 |
| THINK C | — | — | — | — |
| Thue | 2000 | — | — | — |
| TI BASIC | 1979 | — | — | — |
| TI-BASIC | — | — | — | — |
| Tink | 2008 | esoteric programming | — | — |
| Tiny BASIC | 1975 | — | — | — |
| TinyScheme | 1998 | — | — | — |
| TLA+ | 1999 | action language | — | — |
| Toit | — | — | — | — |
| TOM | 1999 | object-oriented programming | — | — |
| ToonTalk | 1995 | concurrent constraint logic programming | — | — |
| Topology and Orchestration Specification for Cloud Applications | — | — | — | — |
| TRAC | 1964 | — | — | 1 |
| Treetop | 2006 | — | — | — |
| Triton | 2021 | — | — | — |
| True BASIC | 1983 | — | — | — |
| TTCN | 1992 | — | — | — |
| TTM | 1968 | — | — | — |
| Turbo Basic | 1987 | — | — | 1 |
| Turbo C++ | 1990 | — | — | — |
| Turbo Pascal | 1983 | object-oriented programming | — | 1 |
| Turbo Pascal OOP | 1989 | — | — | — |
| Turbo51 | — | object-oriented programming | — | — |
| TurboWarp | — | — | — | — |
| Turing | 1982 | procedural programming, object-oriented programming | manifest typing, static typing | — |
| TUTOR | 1969 | procedural programming, imperative programming | — | — |
| TXL | — | functional programming | — | — |
| TypeScript | 2012 | generic programming, event-driven programming, functional programming, imperative programming, object-oriented programming | gradual typing, duck typing, structural typing | 2 |