The Medal for Long Service and Good Conduct (Military) is a medal awarded to regular members of the armed forces. It was instituted by King George V in 1930 and replaced the Army Long Service and Good Conduct Medal as well as the Permanent Forces of the Empire Beyond the Seas Medal. The medal was originally awarded to Regular Army warrant officers, non-commissioned officers and men of the UK Armed Forces. It also had a number of territorial versions for the Permanent Forces of the British Dominions. The eligibility criteria were relaxed in 1947 to also allow the award of the medal to officers who had served a minimum period in the ranks before being commissioned. Since 2016, the eligibility was widened to include officers who had never served in the ranks, and so the medal can now be awarded to all regular members of the British Armed Forces who meet the required length of service.

The Army Long Service and Good Conduct Medal was instituted by King William IV in 1830. The medal remained in use for 100 years, until it was replaced by the Medal for Long Service and Good Conduct (Military) in 1930. During that time the reverse of the medal remained virtually unchanged, while the design of the obverse was altered during the reigns of Queen Victoria, King Edward VII and King George V.