Lajes is a civil parish in the municipality of Praia da Vitória, on the Portguuese island of Terceira in the Azores. The population in 2011 was 3,744, in an area of . It is the second most populous parish in the municipality of Praia da Vitória.
Lajes is best known for being the location of Portuguese Air Force Base No.4, used for military, small inter-island, as well as scheduled and chartered flights from North America and mainland Europe. The U.S. military has a multi-year agreement with the government of Portugal at Lajes Airfield, which is the base for U.S. 65th Air Base Wing (65 ABW).
Lajes is Portuguese for "covering of flat rock", or "flagstone", and may refer to: