Siege of Santarém may refer to:
Conquest of Santarém (1147), a successful siege of the city the Second Crusade Siege of Santarém (1171), an unsuccessful siege of the city by the Almohads Siege of Santarém (1184), an unsuccessful siege of the city by the Almohads
See also De expugnatione Scalabis ('On the Conquest of Santarém'), an account of the conquest of Santarém in 1147