The Sammarinese Armed Forces refers to the national military defence forces of the Republic of San Marino. It is one of the smallest military forces in the world, with its different branches having varied functions including: performing ceremonial duties; patrolling borders; mounting guard at government buildings; and assisting police in major criminal cases. There is also a military Gendarmerie which is part of the military forces of the republic. The entire military corps of San Marino depends upon the co-operation of full-time forces and their retained (volunteer) colleagues, known as the Corpi Militari Volontari, or Voluntary Military Force. National defence in the face of an aggressive world power is, by arrangement, the responsibility of Italy's armed forces. The component parts of the military are distinguished by distinctive cap badges, one each for the Fortress Guard (uniformed), Fortress Guard (artillery), Guard of the Council, Uniformed Militia, Military Ensemble (band), and Gendarmerie. There is no compulsory service, however under special circumstances citizens aged 16 to 55 may be drafted for the defence of the state.

San Marino, officially the Republic of San Marino and also known as the Most Serene Republic of San Marino, is a European microstate and enclave within Italy. Located on the northeastern side of the Apennine Mountains, it is the fifth-smallest country in the world, with a land area of just over 61 km2 and a population of 33,660 as of 2022.