In the Canadian Forces, lieutenant-colonel (LCol, French: lieutenant-colonel or lcol) is a rank for officers who wear army or air force uniform.
A lieutenant-colonel is senior to a major or lieutenant-commander, and junior to a colonel or naval captain.
Lieutenant-colonels are addressed by rank and name and thereafter by subordinates as "Sir" or "Ma'am".
In the Royal Canadian Air Force, lieutenant-colonels are often the commanding officer of flying or ground squadrons.
Before unification of the Canadian Forces in 1968, rank structure and insignia followed the British pattern.