A cenote (English: /sɨˈnoʊtiː/ or /sɛˈnoʊteɪ/; Spanish: [seˈnote] or [θeˈnote]; plural: cenotes; from Yucatec Maya dzonot or ts'onot, "well") is a deep natural pit, or sinkhole, characteristic of Mexico, resulting from the collapse of limestone bedrock that exposes groundwater underneath. Especially associated with the Yucatán Peninsula, and some nearby Caribbean islands, cenotes were sometimes used by the ancient Maya for sacrificial offerings. The term derives from a word used by the low-land Yucatec Maya, "Ts'onot" to refer to any location with accessible groundwater.

Cenotes are surface connections to subterranean water bodies. While the best-known cenotes are large open water pools measuring tens of meters in diameter, such as those at Chichén Itzá, the greatest number of cenotes are smaller sheltered sites and do not necessarily have any surface exposed water. The term cenote has also been used to describe similar karst features in other countries such as Cuba and Australia, in addition to the more generic term of sinkholes.