| A# | 1990 | Algebraic | Japan | Algebraic programming language | |
| ACL | 1990 | Motion-oriented | Japan | ||
| ADETRAN | 1990 | Japan | |||
| ANDOR | 1990 | Horn clause | Japan | AND-OR Prolog | |
| ANDOR-II | 1990 | Horn clause | Japan | AND-OR Prolog | |
| AOPL | 1990 | Japan | |||
| CESP | 1990 | Japan | |||
| COB | 1990 | Japan | C Objects | ||
| DIAL/M | 1990 | Japan | |||
| FACOM-R | 1990 | Specialised Languages | Japan | PL/R on a FACOM minicomputer | |
| P/I | 1990 | Japan | |||
| PL/8 | 1990 | Japan | |||
| PL/R | 1990 | Japan | |||
| PROTO-E | 1990 | Japan | |||
| Real-Time C++ | 1990 | Japan | Real-time extension of C++. | ||
| WORLDS | 1990 | Japan |