| Fortran 90 | 1990 | Numerical Scientific | FORTRAN 90 standard | International | |
| Fortran Extended | 1990 | Multi-purpose | International | Interim name for Fortran 90 | |
| Haskell | 1990 | International | |||
| Muse | 1990 | Specialised Languages | Horn clause | International | Or-Parallel Prolog |
| Object-CHILL | 1990 | Specialised Languages | Pascals | International | Proposed object-oriented extension of CHILL |
| OO-CHILL | 1990 | Specialised Languages | Pascals | International | Proposed object-oriented extension to CHILL |
| Parallel FORTRAN | 1990 | Numerical Scientific | International |