First Officer

First officer stands for:

Military:

• Executive officer , first officer in the military command area
• First Officer (German Navy) (IO, sometimes also 1O), the highest officer after the commander and his deputy on board a ship in the German Navy

Civil area:

• Nautical officer #First officer , deputy subordinate to the captain and superior of the other crew members in merchant shipping
• First officer (aviation) , the second pilot on board an aircraft in civil aviation

This is a disambiguation page for differentiating between several terms identified with the same word.