| O | O | O | LATIN CAPITAL LETTER O |
| o | o | o | LATIN SMALL LETTER O |
| œ | œ | œ | [ANSI - oe ligature; MacRoman - u acute] |
| Π| Π| Π| [ANSI - OE ligature; MacRoman - a ring above] |
| Ò | Ò | Ò | Ò LATIN CAPITAL LETTER O WITH GRAVE |
| Ó | Ó | Ó | Ó LATIN CAPITAL LETTER O WITH ACUTE |
| Ô | Ô | Ô | Ô LATIN CAPITAL LETTER O WITH CIRCUMFLEX |
| Õ | Õ | Õ | Õ LATIN CAPITAL LETTER O WITH TILDE |
| Ö | Ö | Ö | Ö LATIN CAPITAL LETTER O WITH DIAERESIS |
| ò | ò | ò | ò LATIN SMALL LETTER O WITH GRAVE |
| ó | ó | ó | ó LATIN SMALL LETTER O WITH ACUTE |
| ô | ô | ô | ô LATIN SMALL LETTER O WITH CIRCUMFLEX |
| õ | õ | õ | õ LATIN SMALL LETTER O WITH TILDE |
| ö | ö | ö | ö LATIN SMALL LETTER O WITH DIAERESIS |
| Ø | Ø | Ø | Ø LATIN CAPITAL LETTER O WITH STROKE |
| ø | ø | ø | ø LATIN SMALL LETTER O WITH STROKE |
| Ō | Ō | Ō | LATIN CAPITAL LETTER O WITH MACRON |
| ō | ō | ō | LATIN SMALL LETTER O WITH MACRON |
| Ŏ | Ŏ | Ŏ | LATIN CAPITAL LETTER O WITH BREVE |
| ŏ | ŏ | ŏ | LATIN SMALL LETTER O WITH BREVE |
| Ő | Ő | Ő | LATIN CAPITAL LETTER O WITH DOUBLE ACUTE |
| ő | ő | ő | LATIN SMALL LETTER O WITH DOUBLE ACUTE |
| Œ | Œ | Œ | LATIN CAPITAL LIGATURE OE (entity name is Œ) |
| œ | œ | œ | LATIN SMALL LIGATURE OE (entity name is œ) |
| Ɔ | Ɔ | �x0186; | LATIN CAPITAL LETTER OPEN O |
| Ɵ | Ɵ | �x019F; | LATIN CAPITAL LETTER O WITH MIDDLE TILDE |
| Ơ | Ơ | �x01A0; | LATIN CAPITAL LETTER O WITH HORN |
| ơ | ơ | �x01A1; | LATIN SMALL LETTER O WITH HORN |
| Ƣ | Ƣ | �x01A2; | LATIN CAPITAL LETTER OI |
| ƣ | ƣ | �x01A3; | LATIN SMALL LETTER OI |
| Ǒ | Ǒ | �x01D1; | LATIN CAPITAL LETTER O WITH CARON |
| ǒ | ǒ | �x01D2; | LATIN SMALL LETTER O WITH CARON |
| Ǫ | Ǫ | �x01EA; | LATIN CAPITAL LETTER O WITH OGONEK |
| ǫ | ǫ | �x01EB; | LATIN SMALL LETTER O WITH OGONEK |
| Ǭ | Ǭ | �x01EC; | LATIN CAPITAL LETTER O WITH OGONEK AND MACRON |
| ǭ | ǭ | �x01ED; | LATIN SMALL LETTER O WITH OGONEK AND MACRON |
| Ǿ | Ǿ | �x01FE; | LATIN CAPITAL LETTER O WITH STROKE AND ACUTE (present in WGL4) |
| ǿ | ǿ | �x01FF; | LATIN SMALL LETTER O WITH STROKE AND ACUTE (present in WGL4) |
| Ȍ | Ȍ | �x020C; | LATIN CAPITAL LETTER O WITH DOUBLE GRAVE |
| ȍ | ȍ | �x020D; | LATIN SMALL LETTER O WITH DOUBLE GRAVE |
| Ȏ | Ȏ | �x020E; | LATIN CAPITAL LETTER O WITH INVERTED BREVE |
| ȏ | ȏ | �x020F; | LATIN SMALL LETTER O WITH INVERTED BREVE |
| Ȣ | Ȣ | Ȣ | LATIN CAPITAL LETTER OU |
| ȣ | ȣ | ȣ | LATIN SMALL LETTER OU |
| Ȫ | Ȫ | Ȫ | LATIN CAPITAL LETTER O WITH DIAERESIS AND MACRON |
| ȫ | ȫ | ȫ | LATIN SMALL LETTER O WITH DIAERESIS AND MACRON |
| Ȭ | Ȭ | Ȭ | LATIN CAPITAL LETTER O WITH TILDE AND MACRON |
| ȭ | ȭ | ȭ | LATIN SMALL LETTER O WITH TILDE AND MACRON |
| Ȯ | Ȯ | Ȯ | LATIN CAPITAL LETTER O WITH DOT ABOVE |
| ȯ | ȯ | ȯ | LATIN SMALL LETTER O WITH DOT ABOVE |
| Ȱ | Ȱ | Ȱ | LATIN CAPITAL LETTER O WITH DOT ABOVE AND MACRON |
| ȱ | ȱ | ȱ | LATIN SMALL LETTER O WITH DOT ABOVE AND MACRON |
| ɔ | ɔ | ɔ | LATIN SMALL LETTER OPEN O |
| ɵ | ɵ | ɵ | LATIN SMALL LETTER BARRED O |
| ɶ | ɶ | ɶ | LATIN LETTER SMALL CAPITAL OE |
| ɷ | ɷ | ɷ | LATIN SMALL LETTER CLOSED OMEGA |
| ᴏ | ᴏ | ᴏ | LATIN LETTER SMALL CAPITAL O |
| ᴐ | ᴐ | ᴐ | LATIN LETTER SMALL CAPITAL OPEN O |
| ᴑ | ᴑ | ᴑ | LATIN SMALL LETTER SIDEWAYS O |
| ᴒ | ᴒ | ᴒ | LATIN SMALL LETTER SIDEWAYS OPEN O |
| ᴓ | ᴓ | ᴓ | LATIN SMALL LETTER SIDEWAYS O WITH STROKE |
| ᴔ | ᴔ | ᴔ | LATIN SMALL LETTER TURNED OE |
| ᴕ | ᴕ | ᴕ | LATIN LETTER SMALL CAPITAL OU |
| ᴖ | ᴖ | ᴖ | LATIN SMALL LETTER TOP HALF O |
| ᴗ | ᴗ | ᴗ | LATIN SMALL LETTER BOTTOM HALF O |
| ᴼ | ᴼ | ᴼ | MODIFIER LETTER CAPITAL O |
| ᴽ | ᴽ | ᴽ | MODIFIER LETTER CAPITAL OU |
| ᵒ | ᵒ | ᵒ | MODIFIER LETTER SMALL O |
| ᵓ | ᵓ | ᵓ | MODIFIER LETTER SMALL OPEN O |
| ᵔ | ᵔ | ᵔ | MODIFIER LETTER SMALL TOP HALF O |
| ᵕ | ᵕ | ᵕ | MODIFIER LETTER SMALL BOTTOM HALF O |
| ᶗ | ᶗ | ᶗ | LATIN SMALL LETTER OPEN O WITH RETROFLEX HOOK |
| ᶱ | ᶱ | ᶱ | MODIFIER LETTER SMALL BARRED O |
| Ṍ | Ṍ | Ṍ | LATIN CAPITAL LETTER O WITH TILDE AND ACUTE |
| ṍ | ṍ | ṍ | LATIN SMALL LETTER O WITH TILDE AND ACUTE |
| Ṏ | Ṏ | Ṏ | LATIN CAPITAL LETTER O WITH TILDE AND DIAERESIS |
| ṏ | ṏ | ṏ | LATIN SMALL LETTER O WITH TILDE AND DIAERESIS |
| Ṑ | Ṑ | Ṑ | LATIN CAPITAL LETTER O WITH MACRON AND GRAVE |
| ṑ | ṑ | ṑ | LATIN SMALL LETTER O WITH MACRON AND GRAVE |
| Ṓ | Ṓ | Ṓ | LATIN CAPITAL LETTER O WITH MACRON AND ACUTE |
| ṓ | ṓ | ṓ | LATIN SMALL LETTER O WITH MACRON AND ACUTE |
| Ọ | Ọ | Ọ | LATIN CAPITAL LETTER O WITH DOT BELOW |
| ọ | ọ | ọ | LATIN SMALL LETTER O WITH DOT BELOW |
| Ỏ | Ỏ | Ỏ | LATIN CAPITAL LETTER O WITH HOOK ABOVE |
| ỏ | ỏ | ỏ | LATIN SMALL LETTER O WITH HOOK ABOVE |
| Ố | Ố | Ố | LATIN CAPITAL LETTER O WITH CIRCUMFLEX AND ACUTE |
| ố | ố | ố | LATIN SMALL LETTER O WITH CIRCUMFLEX AND ACUTE |
| Ồ | Ồ | Ồ | LATIN CAPITAL LETTER O WITH CIRCUMFLEX AND GRAVE |
| ồ | ồ | ồ | LATIN SMALL LETTER O WITH CIRCUMFLEX AND GRAVE |
| Ổ | Ổ | Ổ | LATIN CAPITAL LETTER O WITH CIRCUMFLEX AND HOOK ABOVE |
| ổ | ổ | ổ | LATIN SMALL LETTER O WITH CIRCUMFLEX AND HOOK ABOVE |
| Ỗ | Ỗ | Ỗ | LATIN CAPITAL LETTER O WITH CIRCUMFLEX AND TILDE |
| ỗ | ỗ | ỗ | LATIN SMALL LETTER O WITH CIRCUMFLEX AND TILDE |
| Ộ | Ộ | Ộ | LATIN CAPITAL LETTER O WITH CIRCUMFLEX AND DOT BELOW |
| ộ | ộ | ộ | LATIN SMALL LETTER O WITH CIRCUMFLEX AND DOT BELOW |
| Ớ | Ớ | Ớ | LATIN CAPITAL LETTER O WITH HORN AND ACUTE |
| ớ | ớ | ớ | LATIN SMALL LETTER O WITH HORN AND ACUTE |
| Ờ | Ờ | Ờ | LATIN CAPITAL LETTER O WITH HORN AND GRAVE |
| ờ | ờ | ờ | LATIN SMALL LETTER O WITH HORN AND GRAVE |
| Ở | Ở | Ở | LATIN CAPITAL LETTER O WITH HORN AND HOOK ABOVE |
| ở | ở | ở | LATIN SMALL LETTER O WITH HORN AND HOOK ABOVE |
| Ỡ | Ỡ | Ỡ | LATIN CAPITAL LETTER O WITH HORN AND TILDE |
| ỡ | ỡ | ỡ | LATIN SMALL LETTER O WITH HORN AND TILDE |
| Ợ | Ợ | Ợ | LATIN CAPITAL LETTER O WITH HORN AND DOT BELOW |
| ợ | ợ | ợ | LATIN SMALL LETTER O WITH HORN AND DOT BELOW |