Persons in alphabetical order
| | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | |
| Person name
| Person name pinyin | Occ | ECPO |
| O'Brien, George | 1 | 1 | |
| O'Sullivan, Maureen | 13 | 1 | |
| O. W. Holmes | 1 | 0 | |
| Oakie, Jack | 6 | 3 | |
| Oberon, Merle | 5 | 2 | |
| Oedipus | 1 | 0 | |
| Oku Mumeo 奧梅尾 | Aimeiwei | 1 | 0 |
| Olaf Williams | Olaf Williams | 1 | 0 |
| Oliver, Edna May | 3 | 0 | |
| Olivia de Havilland | 3 | 6 | |
| Olympe Bradna | 2 | 0 | |
| Ophelia | 1 | 0 | |
| Orfila | 1 | 0 | |
| Orison Swett Marden | 1 | 0 | |
| Overacker, Ronald Le Roy | 4 | 0 | |
| O’Sullivan, Maureen Paula | 13 | 1 | |
| 乙竹岩造 | Ototake Iwazo | 1 | 0 |
| 乙竹岩造 | Ototake Iwazō | 1 | 0 |
| 區晉南 | Ou Jinnan | 1 | 0 |
| 區芳浦 | Ou Fangpu | 1 | 0 |
| 大山捨松 | Oyama Sutematsu | 1 | 0 |
| 大山郁夫 | Oyama Ikuo | 1 | 0 |
| 大村西崖 | Omura Seigai | 2 | 0 |
| 大野信一 | Ono Shinichi | 1 | 0 |
| 大野信一 | Ōno Shinʼichi | 1 | 0 |
| 奧村五百子 | Okumura Ioko | 3 | 0 |
| 尾形月耕 | Ogata Gekko | 1 | 0 |
| 尾形月耕 | Ogata Gekkō | 1 | 0 |
| 尾形正之助 | Ogata Shonosuke | 1 | 0 |
| 尾形正之助 | Ogata Shōnosuke | 1 | 0 |
| 岡倉天心 | Okakura Tenshin | 2 | 0 |
| 岡倉覚三 | Okakura Kakuzo | 2 | 0 |
| 岡倉覚三 | Okakura Kakuzō | 2 | 0 |
| 欧阳予倩 | Ouyang Yuqian | 1 | 0 |
| 歐亞 | Ouya | 1 | 0 |
| 歐允修 | Ou Yunxiu | 1 | 0 |
| 歐則鳴 | Ou Zeming | 1 | 0 |
| 歐宗祐 | Ou Zongyou | 1 | 0 |
| 歐文 | Ouwen | 10 | 0 |
| 歐文光 | Ou Wenguang | 1 | 0 |
| 歐文泰爾保 | Ouwen Taierbao | 10 | 0 |
| 歐爾布拉偉爾 | Ouer Bula Weier | 2 | 0 |
| 歐禮克 | Oulike | 1 | 0 |
| 歐禮克醫生 | Oulike yi sheng | 1 | 0 |
| 歐羅佛連/Erool Flynn | Ouluo Folian | 1 | 0 |
| 歐陽 | Ouyang | 1 | 0 |
| 歐陽女華 | Ouyang Nuhua | 2 | 0 |
| 歐陽子 | Ouyang Zi | 1 | 0 |
| 歐陽淑如 | Ouyang Shuru | 2 | 0 |
| 歐陽漸 | Ouyang Jian | 1 | 0 |
| 歐陽澈 | Ouyang Che | 1 | 0 |
| 歐陽燦霞 | Ouyang Canxia | 2 | 0 |
| 歐陽率更 | Ouyang Lujing | 2 | 0 |
| 歐陽瑱 | Ou Yangtian | 1 | 0 |
| 歐陽瑱女士 | Ou Yangtian nu shi | 1 | 0 |
| 歐陽竟無 | Ouyang Jingwu | 1 | 0 |
| 歐陽詢 | Ouyang Xun | 2 | 0 |
| 歐陽鎮華 | Ouyang Zhenhua | 1 | 0 |
| 歐陽飭 | Ouyang Chi | 1 | 0 |
| 耦菱 | Ou Ling | 1 | 0 |
