Captain lieutenant or captain-lieutenant is a military rank, used in a number of navies worldwide and formerly in the British Army.
The same rank is used in the navies of Denmark (kaptajnløjtnant), Norway (kapteinløytnant) and Finland (Finnish: kapteeniluutnantti; Swedish: Kaptenlöjtnant).
[6] The French Army of the Ancien Régime used a rank of capitaine-lieutenant very similar to the British one.
D'Artagnan is perhaps the most famous captain-lieutenant in French history, as commander of the first mousquetaire company.
Until the introduction of the rank of corvette captain in 1906, the Brazilian Navy followed the Portuguese model of a capitão-tenente being an equivalent of an Army major.
In Russian and other East-European navies it is the most senior junior officer rank (equivalent to "captain" in the Army/Ground Forces).
The Russian Navy assigns this rank the two-and-a-half stripe insignia used in Britain and the US for lieutenant commanders.
In terms of responsibilities, officers of this rank may serve as department heads on larger warships, but may also serve as commanding officers of 3rd and 4th rank warships (Russian ship classifications referring to all from Krivak-class frigates to gunboats and minesweepers).
Unlike the equivalent OF2-rank Kapitänleutnant in the German Navy, submarines are at least nominally not on the list of eligible positions.
This state of affairs was formally recognised with the creation of the rank of captain-lieutenant, with its own entry in the table of prices for the purchase of commissions.