Belen (; Spanish: Belén) is the second most populous city in Valencia County, New Mexico, United States, after its county seat, Los Lunas. The population was 7,269 at the 2010 Census.
Belen is Spanish for Bethlehem but gained the nickname "The Hub City". The city is geographically near the center of New Mexico and has been a significant transportation hub for central New Mexico that includes access to rail, the interstate highway and air at Valencia County's only public airport.
Belen is at the southern end of the Albuquerque Metropolitan Statistical Area. The city is located 35 miles south of Albuquerque.
Belen was founded in 1740 as Nuestra Señora de Belén by a group of colonists led by Diego Torres and Antonio Salazar, who had received permission to settle the tract of land known as the Belen Grant. The early settlers in the Belen grant included several genízaro families. The geníizaros, American Indians with origins as slaves and servants of the colonists, were important in the frontier defense of New Mexico. For the genízaros, relocation to Belen and other frontier settlements was a means of acquiring land.