Masin may refer to:
Places Kampong Masin, a Bruneian village Masin (island), an island in the Philippines Masin, Iran, an Iranian village Masin District, a Peruvian administrative subdivision Masin, Peru, the capital of Masin District
People Mašín, Czech surname Arnold Masin (born 1977), Polish politician Draga Mašin (1864–1903), Queen of Serbia George Masin (born 1947), American fencer Gwendolyn Masin (born 1977), Dutch violinist Lucila Masin (born 1984), Argentine politician Sandra Masin (born 1942), American politician