| ID | Name | Type |
|---|---|---|
| #5764 | Harris Software | Z |
| #19006 | Harris [Bearsden Primary 2019] | + |
| #17333 | Harrow Micro | S |
| #5765 | Harry Anbarlian | + |
| #19623 | Harry Bates | + |
| #5766 | Harry Capeling | + |
| #5767 | Harry Capeling & Anne Capeling | ? |
| #5768 | Harry Deakin | + |
| #5769 | Harry Harrison | + |
| #5770 | Harry L. Helms | + |
| #18628 | Harry M. Hardjono | + |
| #5771 | Harry Manley | + |
| #5772 | Harry S. Price | + |
| #5773 | Harry Whitehouse | + |
| #5774 | Hartland Software | P |
| #5775 | Hartmut Fiebig | ? |
| #5776 | Hartmut Seba | ? |
| #5777 | Hartsoft | Z |
| #5778 | Hartung-Gorre Verlag | ? |
| #22195 | Harvest | - |