承办来港旅行团    organising package tours to Hong Kong

石油出口国组织    Organization for Petroleum Exporting Countries（OPEC）

筹办千人接待会    organized 1，000-guest receptions

有机气中毒    organochlorine poisoning

促进性高潮的药物    orgasm-promoting drug

伪造旅行证件    orged travel documents

泰国东方航空    Orient Thai

东方日报    Oriental Daily

东方报业集团    Oriental Press Group

东方新地    Oriental Sunday Magazine

原始网络识别码    Original Network ID (OID)

原本四位候选人打算平均配票。    Originally， the four politicians had planned to seek an equal share of the vote.

整型外科医师    orthopedic surgeon

拉登    Osama bin Laden

骨质疏松症    osteoporosis

不再准许员工无薪加班/做无薪    OT stop people from working longer hours without an overtime bonus

其它老年病    other illnesses associated

其它收入来源    other sources of revenue

其它无法控制的因素    other uncontrollable factors

中耳炎    otitis medial tympanitis

我们的民主派议员    our democratic councillors

我们的选举工程还未完全开动。    Our electioneering machinery is not yet in full swing.

圣母医院    Our Lady of Maryknoll

我们最保守估计    our most conservative projection

迫走某人出局    oust somebody

伸手试探她是否仍有呼吸    out his hand to see if there was any breathing

落伍、过时    out of step with the times

外访旅行团    outbound package tour

出境游    outbound tourism

户外广告    outdoor advertisements

户外广告板    outdoor advertising hoardings and billboards

外勤工作人员    outdoor staff

外胸膜    outer pleural membrane

离岛    outlying island

离岛线    outlying island routes

边远贫困地区    outlying poverty-stricken areas

庭外和解    out-of-court settlement （n）； reach an out-of-court settlement

惊人的公众注意    outrageous publicity

外展社会工作队    outreaching social work team

外判非核心业务    outsourcing of non-core services

《一笔    out消》播影时段的三十秒广告费高达九十八万八千元charging advertisers as much as $988，000 for a 30-second slot for The Weakest Link

一笔    out消The Weakest Link