Altamira (Brazilian Portuguese: ) is one of one hundred and forty-four municipalities in the state of Pará, in northern Brazil. It has an area of , making it the largest municipality by area both in Pará state and Brazil, and until 2009 it was the world's largest municipal subdivision. It occupies 12.8% of the state's territory, 1.8% of Brazil's territory and 0.8% of South America. It also covers a more extensive area than 104 countries, and is comparable to the US State of Missouri or Florida.