Sailor first class () is a rank used in the navies of many countries.

Canada As of August 2020, the Royal Canadian Navy replaced the term seaman with the gender-neutral term sailor. Leading seamen are now referred to as "sailor first class" (often abbreviated as "S1").

NATO code While the rank is used in a number of NATO countries, it is ranked differently depending on the country. NATO code Country English equivalent UK US OR-3 Canada, Portugal Seaman OR-2 Belgium, Netherlands, Spain Able seaman Seaman apprentice

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