| Behaviour Algebra | 1978 | United Kingdom | |||
| BS12 | 1978 | United Kingdom | |||
| CAJOLE | 1978 | Business Data Processing | United Kingdom | Westfield dataflow language | |
| CON-A | 1978 | On-Line | United Kingdom | Conversational Algol | |
| CSP | 1978 | United Kingdom | Communicating Sequential Processes | ||
| DEMOS | 1978 | Specialised Languages | Process interaction | United Kingdom | Extensions to Simula |
| EPL | 1978 | Multi-purpose | United Kingdom | Experimental Programming Language | |
| HOPE | 1978 | United Kingdom | |||
| LAPSE | 1978 | United Kingdom | Single assignment language | ||
| Lispkit Lisp | 1978 | String and List Processing | Lazy Evaluation LISPs | United Kingdom | |
| MICA | 1978 | Excluded from Sammet | United Kingdom | ||
| Network Control Language | 1978 | United Kingdom | Language for explicit control of networks | ||
| PPL | 1978 | Specialised Languages | Pascals | United Kingdom | portable systems language |
| Program Synthesis | 1978 | United Kingdom | |||
| RPL 11M | 1978 | United Kingdom | |||
| S-Snobol | 1978 | String and List Processing | United Kingdom | Structured SNOBOL |