(1)法院院长；(法庭)审判长
指主管某一法院或某一司法地区的法官，尤指在由三名法官组成的审理案件的合议庭中资深的、起主要作用的法官。

(2)首席法官
简写为P.J.。

• Old Michaelmas Day
• Old Midsummer Day
• Old Natura Brevium/O.N.B.
• old rent
• old school
• old school physician
• old style calendar
• old style/O.S.
• Old Tenures
• oligarchy
• olograph
• olographic will
• om
• ombudsman
• ome bueno
• omissa vel male appretiate
• omissio
• Omissio eorum quae tacite insunt nihil operatur.
• omission
• omissis omnibus aliis negotiis
• omissus
• omits to provide
• omittance
• omitted property
• omme