Lance-Corporal is a military rank used by the Australian Army, the New Zealand army, the United States Marine Corps, the Singapore Armed Forces, the British Army, and the British Royal Marines.

In all of these services except for the USMC, Lance-Corporal is the lowest rank able to be held by a non-commissioned officer. Generally, the holder of this rank is the leader of a 4-man fireteam, and/or is second in command of a squad of 7-12 soldiers.

In the USMC, the rank of Lance-Corporal has the paygrade of E-3, which is equivalent to a Private First Class in the US Army, a Seaman in the US Navy, or an Airman First Class in the US Air Force. Promotion to the rank of Lance-Corporal is usually automatic, unless the promotion is delayed for disciplinary or punitive reasons. A marine enlisting in the USMC can expect to be promoted to Private First Class after six months of service, and the promotion to Lance-Corporal after eight months time in grade. Promotion to the next rank, Corporal is dependent upon vacancies in the marine's MOS, and a composite score which is calculated using the marine's rifle qualification scores, results of their personal fitness tests, time in service and grade, duty proficiency scores, and any bonus points from education or specialized positions. Further, in order to be promoted to Corporal, the Lance-Corporal must have a year in service and have served 8 months as a Lance-Corporal.

The rank of Lance-Corporal is held by 30% of the enlisted marines in the USMC, making it the most common rank held.