San Ildefonso Pueblo is a census-designated place (CDP) in Santa Fe County, New Mexico, United States, and a federally recognized tribe, established c. 1300 C.E. The Pueblo is self-governing and is part of the Santa Fe, New Mexico Metropolitan Statistical Area. The population was 524 as of the 2010 census, reported by the State of New Mexico as 1,524 in 2012, and there were 628 enrolled tribal members reported as of 2012 according to the Department of the Interior. San Ildefonso Pueblo is a member of the Eight Northern Pueblos, and the pueblo people are from the Tewa ethnic group of Native Americans, who speak the Tewa language.

Santa Fe County is located in the U.S. state of New Mexico. As of the 2020 census, the population was 154,823, making it New Mexico's third-most populous county, after Bernalillo County and Doña Ana County. Its county seat is Santa Fe, the state capital.