Delta 4
| Industry | Video games | 
|---|---|
| Founded | 1984 | 
| Founder | Fergus McNeill | 
| Defunct | 1992 | 
| Fate | Defunct | 
| Headquarters | |
| Website | Delta4.co.uk | 
Delta 4 was a British software developer founded by Fergus McNeill, writing and publishing interactive fiction.
Delta 4 designed games between 1984 and 1992. Some were self-published, others were released by CRL Group, Piranha Software, Silversoft, or On-Line Entertainment. Delta 4 were also credited with providing the code for Jonathan Nash's tape magazine YS2 which was given away free with Your Sinclair magazine and published by Future Publishing.