Cayey (Spanish pronunciation: [kaˈʝej]) (official name Cayey de Muesas) is a mountain municipality in central Puerto Rico (U.S.) located on the Central Mountain range, north of Salinas and Guayama; south of Cidra and Caguas; east of Aibonito and Salinas; and west of San Lorenzo. Cayey is spread over 21 barrios plus Cayey Pueblo (the downtown area and the administrative center). It is part of the San Juan-Caguas-Guaynabo Metropolitan Statistical Area.
Cayey is notable for its surrounding mountains. The city has been actively growing since the 1990s, evidenced by its designation as a Metropolitan Area by the U.S. Census Bureau. It has experienced significant growth in commerce, and many major retailers, such as Wal-Mart have opened stores in the city. Industries in Cayey include sugar, tobacco and poultry. For tobacco there is a well-known company called Consolidated Cigar Corp. A new coliseum and hospital facilities have also been built. Coca-Cola is a major corporation that has a manufacturing facility in the town.