Major (Maj) is a military rank which is used by both the British Army and Royal Marines.

This practice was frowned on outside the trenches but was given official sanction in 1917 as an alternative, being made permanent in 1920 when the cuff badges were abolished.

After World War II, major became the usual rank held by officers commanding all companies, squadrons, and batteries.

In the 21st century British Army, officers normally attain the rank after around eight to 10 years of commissioned service.

A common job for a major is the command of a sub-unit of 120 or fewer junior officers and soldiers.