Sceloporus lundelli, also known commonly as Lundell's spiny lizard and la espinosa de Lundell in Mexican Spanish, is a species of lizard in the family Phrynosomatidae. The species is native to the Yucatán Peninsula in Mexico, Belize, and Guatemala. There are two recognized subspecies.
S. lundelli is found in the Mexican states of Campeche, Quintana Roo, Tabasco, and Yucatán, in the Belizean district of Cayo, and in the Guatemalan department of El Petén.
The preferred natural habitat of S. lundelli is forest at altitudes from sea level to , but it has also been found in urban areas.
Adults of S. lundelli may attain a snout-to-vent length (SVL) of .
S. lundelli is diurnal and arboreal.
The mode of reproduction of S. lundelli is uncertain: it has been reported to be oviparous, but may be viviparous.
Two subspecies are recognized as being valid, including the nominotypical subspecies.
The specific name, lundelli, is in honor of American botanist Cyrus Longworth Lundell.
The subspecific name, gaigeae, is in honor of American herpetologist Helen Beulah Thompson Gaige.