Public service
- Executive Officer - a grade in the British Civil Service
- 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
This disambiguation page lists articles associated with the title First officer.
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