First officer

First officer may refer to:

Transportation[edit]

Chief mate, the second-in-command (usually) of a merchant ship
First officer (aviation) or "co-pilot", the second pilot of a civil aircraft

Military[edit]

Executive officer (military), the second-in-command of a naval vessel
First officer, the most senior civil service position in the United States Foreign Service
First officer, a rank in the Air Transport Auxiliary corresponding to Flight Lieutenant in the Royal Air Force
First officer, a rank in the Women's Royal Naval Service corresponding to Lieutenant-Commander in the Royal Navy

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