Lieutenant general (Lt Gen), formerly more commonly lieutenant-general, is a senior rank in the British Army and the Royal Marines.

The rank insignia for both the Army and the Royal Marines is a crown over a crossed sabre and baton.

Ordinarily, lieutenant general is the rank held by the officer in command of an entire battlefield corps.

Additionally, three lieutenant general appointments also exist within the extant British Army's Headquarters.

Additionally, the retired Royal Navy admiral John de Mestre Hutchison held an honorary RAF commission in the rank of lieutenant general.