Captains Regent are the two heads of state of the Republic of San Marino. They are elected every six months by the Grand and General Council, the country's legislative body. Normally the Regents are chosen from parties in coalition and serve a six-month term. The investiture of the Captains Regent takes place on 1 April and 1 October every year. This tradition dates back at least to 1243.

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.