| 歐 | [ oū ] Europe, abbr. for 歐洲|欧洲[Ou1 zhou1], surname Ou |
| 歐 | [ oū ] (used for transliteration), old variant of 謳|讴[ou1] |
| 歐亞 | [ oū yà ] Europe and Asia, Eurasia |
| 歐亞大陸 | [ oū yà dà lù ] Eurasia |
| 歐亞紅尾鴝 | [ oū yà hóng weǐ qú ] (bird species of China) common redstart (Phoenicurus phoenicurus) |
| 歐亞鴝 | [ oū yà qú ] (bird species of China) European robin (Erithacus rubecula) |
| 歐亞鵟 | [ oū yà kuáng ] (bird species of China) common buzzard (Buteo buteo) |
| 歐仁 | [ oū rén ] Eugene (name) |
| 歐伯林 | [ oū bó lín ] Oberlin |
| 歐佩克 | [ oū peì kè ] OPEC, Organization of the Petroleum Exporting Countries |
| 歐元 | [ oū yuán ] euro (currency) |
| 歐元區 | [ oū yuán qū ] Eurozone |
| 歐共體 | [ oū gòng tǐ ] abbr. for 歐洲共同體|欧洲共同体, European Community (old term for the EU, European Union) |
| 歐冠 | [ oū guàn ] UEFA Champions League |
| 歐分 | [ oū fēn ] euro cent |
| 歐吉桑 | [ oū jí sāng ] older man, man of mature years (Japanese loanword) |
| 歐咪呀給 | [ oū mī yā geǐ ] (Tw) gift given when visiting sb (esp. a local specialty brought back from one's travels, or a special product of one's own country taken overseas) (loanword from Japanese "omiyage") |
| 歐夜鷹 | [ oū yè yīng ] (bird species of China) European nightjar (Caprimulgus europaeus) |
| 歐姆 | [ oū mǔ ] ohm (loanword) |
| 歐姆蛋 | [ oū mǔ dàn ] omelette |
| 歐姆龍 | [ oū mǔ lóng ] Omron Corporation (Japanese electronics company) |
| 歐安組織 | [ oū ān zǔ zhī ] Organization for Security and Cooperation in Europe (OSCE), abbr. for 歐洲安全與合作組織|欧洲安全与合作组织[Ou1 zhou1 An1 quan2 yu3 He2 zuo4 Zu3 zhi1] |
| 歐寶 | [ oū baǒ ] Opel (car brand) |
| 歐尼 | [ oū ní ] (female usage) older sister (loanword from Korean "eonni") |
| 歐巴 | [ oū bā ] (female usage) older brother (loanword from Korean "oppa"), male friend |
| 歐巴桑 | [ oū ba sāng ] older female, woman of mature years (Japanese loanword) |
| 歐巴馬 | [ oū bā mǎ ] Taiwanese variant of 奧巴馬|奥巴马[Ao4 ba1 ma3], Barack Obama (1961-), US Democrat politician, president 2009-2017 |
| 歐幾里得 | [ oū jǐ lǐ dé ] Euclid of Alexandria (c. 300 BC), Greek geometer and author Elements 幾何原本|几何原本 |
| 歐幾里德 | [ oū jǐ lǐ dé ] Euclid of Alexandria (c. 300 BC), Greek geometer and author of Elements 幾何原本|几何原本 |
| 歐式 | [ oū shì ] in the European style, Euclidean |
| 歐式幾何 | [ oū shì jǐ hé ] Euclidean geometry |
| 歐式幾何學 | [ oū shì jǐ hé xué ] Euclidean geometry |
| 歐拉 | [ oū lā ] Leonhard Euler (1707-1783), Swiss mathematician |
| 歐文 | [ oū wén ] Owen (name), Erwin (name), Irvine, California |
| 歐文斯 | [ oū wén sī ] Owens (name) |
| 歐斑鳩 | [ oū bān jiū ] (bird species of China) European turtle dove (Streptopelia turtur) |
| 歐朋 | [ oū péng ] Opera (web browser) |
| 歐柏林 | [ oū bó lín ] Oberlin |
| 歐查果 | [ oū chá guǒ ] medlar |
| 歐柳鶯 | [ oū liǔ yīng ] (bird species of China) willow warbler (Phylloscopus trochilus) |
| 歐榛 | [ oū zhēn ] common hazel (tree) (Corylus avellana) |
| 歐歌鶇 | [ oū gē dōng ] (bird species of China) song thrush (Turdus philomelos) |
| 歐氏 | [ oū shì ] Euclid, abbr. for 歐幾里得|欧几里得 |
| 歐氏幾何學 | [ oū shì jǐ hé xué ] Euclidean geometry |
| 歐泊 | [ oū bó ] opal (Sanskrit: upala) |
| 歐洲 | [ oū zhoū ] Europe, abbr. for 歐羅巴洲|欧罗巴洲[Ou1 luo2 ba1 Zhou1] |
| 歐洲中央銀行 | [ oū zhoū zhōng yāng yín háng ] European Central Bank |
| 歐洲之星 | [ oū zhoū zhī xīng ] Eurostar (train line) |
| 歐洲人 | [ oū zhoū rén ] European (person) |
| 歐洲共同市場 | [ oū zhoū gòng tóng shì chǎng ] European common market (old term for EU, European Union) |
| 歐洲共同體 | [ oū zhoū gòng tóng tǐ ] European Community, old term for EU, European Union 歐盟|欧盟[Ou1 meng2] |
| 歐洲刑警組織 | [ oū zhoū xíng jǐng zǔ zhī ] Europol (European Police Office) |
| 歐洲原子能聯營 | [ oū zhoū yuán zǐ néng lián yíng ] Euratom |
| 歐洲大陸 | [ oū zhoū dà lù ] continent of Europe |
| 歐洲安全和合作組織 | [ oū zhoū ān quán hé hé zuò zǔ zhī ] Organization for Security and Cooperation in Europe (OSCE) |
| 歐洲安全與合作組織 | [ oū zhoū ān quán yǔ hé zuò zǔ zhī ] Organization for Security and Cooperation in Europe (OSCE) |
| 歐洲山楊 | [ oū zhoū shān yáng ] European poplar (Populus tremula) |
| 歐洲杯 | [ oū zhoū beī ] European Cup (e.g. soccer) |
| 歐洲核子中心 | [ oū zhoū hé zǐ zhōng xīn ] European Organization for Nuclear Research CERN, at Geneva |
| 歐洲核子研究中心 | [ oū zhoū hé zǐ yán jiū zhōng xīn ] European Organization for Nuclear Research CERN, at Geneva |
| 歐洲歌唱大賽 | [ oū zhoū gē chàng dà saì ] Eurovision Song Contest |
| 歐洲法院 | [ oū zhoū fǎ yuàn ] European Court of Justice |
| 歐洲理事會 | [ oū zhoū lǐ shì huì ] European Council |
| 歐洲聯盟 | [ oū zhoū lián méng ] European Union (EU) |
| 歐洲自由貿易聯盟 | [ oū zhoū zì yoú maò yì lián méng ] European Free Trade Association |
| 歐洲航天局 | [ oū zhoū háng tiān jú ] European Space Agency (ESA) |
| 歐洲語言 | [ oū zhoū yǔ yán ] European language |
| 歐洲議會 | [ oū zhoū yì huì ] European Parliament |
| 歐洲貨幣 | [ oū zhoū huò bì ] Euro, European currency |
| 歐洲防風 | [ oū zhoū fáng fēng ] parsnip (Pastinaca sativa) |
| 歐洲電視 | [ oū zhoū diàn shì ] European TV, Eurovision |
| 歐珀萊 | [ oū pò laí ] Aupres, Shiseido's line in China |
| 歐當歸 | [ oū dāng guī ] (botany) lovage, Levisticum officinale |
| 歐盟 | [ oū méng ] European Union, EU |
| 歐盟委員會 | [ oū méng weǐ yuán huì ] Commission of European Union |
| 歐石鴴 | [ oū shí héng ] (bird species of China) Eurasian stone-curlew (Burhinus oedicnemus) |
| 歐米伽 | [ oū mǐ gā ] omega (Greek letter Ωω) |
| 歐米茄錶公司 | [ oū mǐ jiā gōng sī ] Omega SA, Swiss luxury watchmaker |
| 歐納西斯 | [ oū nà xī sī ] see 奧納西斯|奥纳西斯[Ao4 na4 xi1 si1] |
| 歐羅巴 | [ oū luó bā ] Europe |
| 歐羅巴洲 | [ oū luó bā zhoū ] Europe, abbr. to 歐洲|欧洲[Ou1 zhou1] |
| 歐美 | [ oū meǐ ] Europe and America, the West |
| 歐芹 | [ oū qín ] parsley (Petroselinum sativum) |
| 歐若拉 | [ oū ruò lā ] Aurora, Roman goddess of dawn |
| 歐萊雅 | [ oū laí yǎ ] L'Oréal (French cosmetics company) |
| 歐蒔蘿 | [ oū shí luó ] cumin (Cuminum cyminum) |
| 歐蝶魚 | [ oū dié yú ] plaice |
| 歐豬 | [ oū zhū ] (economics) (derog.) PIGS (Portugal, Italy, Greece and Spain), PIIGS (Portugal, Italy, Ireland, Greece and Spain) |
| 歐車前 | [ oū chē qián ] psyllium (genus Plantago) |
| 歐里庇得斯 | [ oū lǐ bì dé sī ] Euripides (c. 480-406 BC), Greek tragedian, author of Medea, Trojan Women etc |
| 歐金斑鴴 | [ oū jīn bān héng ] (bird species of China) European golden plover (Pluvialis apricaria) |
| 歐金翅雀 | [ oū jīn chì què ] (bird species of China) European greenfinch (Chloris chloris) |
| 歐陽 | [ oū yáng ] two-character surname Ouyang |
| 歐陽予倩 | [ oū yáng yú qiàn ] Ouyang Yuqian (1889-1962), Chinese actor |
| 歐陽修 | [ oū yáng xiū ] Ouyang Xiu (1007-1072), Northern Song dynasty prose writer and historian |
| 歐陽詢 | [ oū yáng xún ] Ouyang Xun (557-641), one of Four Great Calligraphers of early Tang 唐初四大家[Tang2 chu1 Si4 Da4 jia1] |
| 歐鴿 | [ oū gē ] (bird species of China) stock dove (Columba oenas) |
| ⇒ 一個幽靈在歐洲遊蕩 | [ yī gè yoū líng zaì oū zhoū yoú dàng ] Ein Gespenst geht um in Europa., the opening sentence of Marx and Engels' "Communist Manifesto" |
| ⇒ 中歐 | [ zhōng oū ] China-Europe (e.g. trading relations), Central Europe |
| ⇒ 亞歐 | [ yà oū ] see 歐亞|欧亚[Ou1 Ya4] |
| ⇒ 亞歐大陸 | [ yà oū dà lù ] Eurasian continent |
| ⇒ 亞歐大陸橋 | [ yà oū dà lù ] Eurasian land bridge (rail line linking China and Europe) |
| ⇒ 亞歐大陸腹地 | [ yà oū dà lù fù dì ] Eurasian hinterland (i.e. Central Asia including Xinjiang) |
| ⇒ 傑西b7歐文斯 | [ jié xī oū wén sī ] Jesse Owens (1913-1980), American athlete |
| ⇒ 僕歐 | [ pú oū ] (old) waiter (loanword from "boy"), attendant |
| ⇒ 北歐 | [ beǐ oū ] north Europe, Scandinavia |
| ⇒ 北歐航空公司 | [ beǐ oū háng kōng gōng sī ] Scandinavian Airlines (SAS) |
| ⇒ 南歐 | [ nán oū ] Southern Europe |
| ⇒ 卡西歐 | [ kǎ xī oū ] Casio |
| ⇒ 印歐人 | [ yìn oū rén ] Indo-European (person) |
| ⇒ 印歐文 | [ yìn oū wén ] Indo-European (language) |
| ⇒ 印歐語 | [ yìn oū yǔ ] Indo-European (language) |
| ⇒ 印歐語系 | [ yìn oū yǔ xì ] Indo-European family of languages |
| ⇒ 印歐語言 | [ yìn oū yǔ yán ] Indo-European (language) |
| ⇒ 拖歐 | [ tuō oū ] to go through a difficult and protracted process in withdrawing from the EU, as in the case of Brexit (a play on 脫歐|脱欧[tuo1 Ou1]) |
| ⇒ 東歐 | [ dōng oū ] Eastern Europe |
| ⇒ 東歐平原 | [ dōng oū píng yuán ] East European Plain |
| ⇒ 瑪俐歐 | [ mǎ lì oū ] Mario (Nintendo video game character), also transcribed variously as 馬里奧|马里奥[Ma3 li3 ao4], 馬力歐|马力欧[Ma3 li4 ou1] etc |
| ⇒ 皺葉歐芹 | [ zhoù yè oū qín ] curled-leaf parsley (Petroselinum crispum) |
| ⇒ 碧歐泉 | [ bì oū quán ] Biotherm (brand name) |
| ⇒ 穆罕默德b7歐瑪 | [ mù hǎn mò dé oū mǎ ] Mullah Mohammad Omar (c. 1960-2013), Taliban leader, Afghan head of state 1996-2001 |
| ⇒ 米歐 | [ mǐ oū ] mu (Greek letter Μμ) |
| ⇒ 紮歐紮翁 | [ zā oū zā wēng ] name of village in Nyima county, Nagchu prefecture, Tibet |
| ⇒ 羅密歐 | [ luó mì oū ] Romeo (name) |
| ⇒ 羅密歐與朱麗葉 | [ luó mì oū yǔ zhū lì yè ] Romeo and Juliet, 1594 tragedy by William Shakespeare 莎士比亞|莎士比亚 |
| ⇒ 美歐 | [ meǐ oū ] US and EU, America-Europe |
| ⇒ 脫亞入歐 | [ tuō yà rù oū ] to abandon the old (Asian) ways and learn from Europe, refers to the ideas that led to the Meiji Restoration and Japan's subsequent colonization projects in Asia |
| ⇒ 脫歐 | [ tuō oū ] to withdraw from the European Union, abbr. for 脫離歐盟|脱离欧盟 |
| ⇒ 西歐 | [ xī oū ] Western Europe |
| ⇒ 西歐聯盟 | [ xī oū lián méng ] Western European Union (WEU) |
| ⇒ 阿法羅密歐 | [ ā fǎ luō mì oū ] Alfa Romeo |
| ⇒ 阿爾法b7羅密歐 | [ ā ěr fǎ luó mì oū ] Alfa Romeo |
| ⇒ 非歐幾何 | [ feī oū jǐ hé ] non-Euclidean geometry |
| ⇒ 非歐幾何學 | [ feī oū jǐ hé xué ] non-Euclidean geometry |