| PS FontName | Adobe | Macintosh | Karl Berry |
|
| OCRA | oa | OCRA | poar8y |
| OCRA-Alternate | oaalt | OCRAAlt |
| OCRB | ob | OCRB | pobr8y |
| OCRB-Alternate | obalt | OCRBAlt |
| OctavianMT | ocrg | OctavMT | movr8y |
| OctavianMT-Expert | ocexp | OctavMTExp | movr8x |
| OctavianMT-Italic | oci | OctavMTIta | movri8y |
| OctavianMT-ItalicExpert | ocixp | OctavMTItaExp | movri8x |
| OctavianMT-ItalicOsF | ocio | OctavMTItaOsF | movri8x |
| OctavianMT-SC | ocsc | OctavMTSC | movrc8y |
| OfficinaSans-Bold | owb | OfficSanBol |
| OfficinaSans-BoldItalic | owbi | OfficSanBolIta |
| OfficinaSans-Book | owbk | OfficSanBoo |
| OfficinaSans-BookItalic | owwi | OfficSanBooIta |
| OfficinaSerif-Bold | ovb | OfficSerBol |
| OfficinaSerif-BoldItalic | ovbi | OfficSerBolIta |
| OfficinaSerif-Book | ovbk | OfficSerBoo |
| OfficinaSerif-BookItalic | ovwi | OfficSerBooIta |
| OldClaudeLP | oj | OldClaLP |
| OldClaudeLP-OsF | ojosf | OldClaLPOsF |
| OldClaudeLP-SC | ojsc | OldClaLPSC |
| OldStyleSeven | os | OldStySev | po7r8y |
| OldStyleSeven-Italic | osi | OldStySevIta | po7ri8y |
| OldStyleSeven-ItalicOsF | osios | OldStySevItaOsF | po7ri8x |
| OldStyleSeven-SC | ossc | OldStySevSC | po7rc8y |
| Olympian | ol | Olymp | poyr8y |
| Olympian-Bold | olb | OlympBol | poyb8y |
| Olympian-BoldItalic | olbi | OlympBolIta | poybi8y |
| Olympian-Italic | oli | OlympIta | poyri8y |
| Omnia | omni | Omnia | pomr8y |
| Ondine | og | Ondin |
| OnyxMT | ox | OnyxMT | moxr8y |
| Optima | op | Optim | popr8y |
| Optima-Black | opbl | OptimBla |
| Optima-BlackItalic | opbli | OptimBlaIta |
| Optima-Bold | opb | OptimBol | popb8y |
| Optima-BoldItalic | opbi | OptimBolIta |
| Optima-BoldOblique | opbo | OptimBolObl | popbo8y |
| Optima-DemiBold | opd | OptimDemBol |
| Optima-DemiBoldItalic | opdi | OptimDemBolIta |
| Optima-ExtraBlack | opf | OptimExtBla |
| Optima-ExtraBlackItalic | opxfi | OptimExtBlaIta |
| Optima-Italic | opi | OptimIta |
| Optima-Medium | opm | OptimMed |
| Optima-MediumItalic | opmi | OptimMedIta |
| Optima-Oblique | opo | OptimObl | popro8y |
| Orator | or | Orato | porr8y |
| Orator-Slanted | orsl | OratoSla | porro8y |
| Ouch | oq | Ouch |
| Oxford | of | Oxfor |
| Ozwald | ozh | Ozwal |
|