is a small man-made island-city off the coast in the municipality of Santiago Ixcuintla in the Mexican state of Nayarit. Legend has it that it was the Aztlan of the Aztecs, their home city and birthplace from where they set out on their pilgrimage in 1091 that led them to the founding of Tenochtitlan.

This island is now being promoted as a tourist attraction and has been designated a "Pueblo Magico" by the federal government. It is accessible by boat from La Batanza, which is the dock area located some 40 kilometers from Santiago Ixcuintla. It is known as "The Mexican Venice" (La Venecia mexicana).

In the 2010 INEGI census, there were 818 inhabitants residing in Mexcaltitán.