Rancho San Carlos may refer to:
Rancho San Carlos de Jonata, a Mexican land grant in present-day Santa Barbara County, California, United States Santa Lucia Preserve, Monterey County, California, United States, formerly known as Rancho San Carlos Rancho San Carlos, an estate at San Carlos Nuevo Guaymas, a beachfront subdivision in Guayamas, Sonora, Mexico Rancho Potrero de San Carlos, a Mexican land grant in present-day Monterey County, California, United States Rancho San Carlos, an estate designed by Reginald Johnson in Santa Barbara County, California, United States