Massamá is a Portuguese freguesia (parish) in Sintra concelho (municipality), and a suburb of Lisbon. Separated from Queluz in 1997, it has an area of 2.78 km² and a population of 28,176 (2001 est.)

The freguesia consists of three different zones. The old zone is known as the 2nd phase, a newer zone is known as the 6th phase, while the newest zone, Massamá-Norte (North Massamá) is located in the frontier between Massamá and Oeiras.

Altough the town already has enough people to be considered a city, it hasn't yet been made one due to political issues and lack of infrastruture such as fire department, police department and cinemas.