San Cayetano Partido is a partido of Buenos Aires Province in Argentina.
The provincial subdivision has a population of about 8,399 inhabitants in an area of . Its capital city is San Cayetano, which is around from Buenos Aires.
The partido and its cabecera (capital) are named after San Cayetano, a Catholic Saint (1480-1547). In Argentina, he is known as patrón del trabajo, translated as the patron saint of work in English.