Monsanto is a village in the civil parish of Monsanto e Idanha-a-Velha, in the municipality of Idanha-a-Nova, District of Castelo Branco, Portugal. In 2011, it covered an area of 131.76 km2 and had 828 inhabitants. Monsanto would become popularly known as "the most Portuguese village of Portugal" due to a government-sponsored competition that awarded twelve historic villages the distinction of Most Portuguese Village of their own province in 1938.