Captain is the highest line-officer rank used in Starfleet, immediately superior commander. A captain may be a department head or commanding officer of a starship or starbase, an aide-de-camp or adjutant of a flag officer, or a fleet captain.
The commanding officer of a vessel is addressed as "captain" while on their ship, regardless of rank.
The rank is equivalent to the Marines rank of colonel, flight commander in the Federation Starfighter Corps, the Cardassian Union title of gul, the Ferengi quasi-military title of daimon, and the Romulan and pre-Federation Vulcan rank of commander.
|Enlisted ranks||Non-commissioned officer ranks||Etc||Commissioned ranks||Flag ranks|
|Federation Marine Corps||Pvt||PFC||LCpl||Cpl||Sgt||SSgt||GySgt||MSgt|
|WO||2nd Lt||1st Lt||Capt||Maj||LtCol||Col||BGen||MajGen||LtGen||Gen||GenCorps
|Klingon ground troops||Bekk2||Bekk1||Cpl||Sgt||MSgt||SgtMaj||2nd Lt||1st Lt||Capt||Maj||LtCol||Col||Brig||LtGen||Gen|
|Romulan Star Navy||UHL||(unknown)||SLt||Lt||Cent||SCdr||Cdr||Adm|
|Tal Shiar||2nd Lt||1st Lt||Capt||Maj||Col||Gen|