Lajas, known historically and culturally as Santa Isabel de las Lajas, is a municipality and town in the Cienfuegos Province of Cuba.

It is located in the northern part of the province, 35 kilometres (22 mi) west of Santa Clara and immediately south of the A1 motorway.

The firsts settlements of the area began in 1800, with Lajas forming on August 29, 1824, named Santa Isabel de las Lajas, after a Canary Islander named it after his wife, Isabel Castellón.

In 1854 Lajas changed from a hamlet into a town by Ayuntamiento of the city of Cienfuegos.

In 1986, El Grupo Técnico Asesor (GTA) of Cuba made the name of the municipality in just simply Lajas.