Religion in South Korea is diverse. Most South Koreans have no religion. Buddhism and Christianity are the dominant confessions among those who affiliate with a formal religion. Buddhism, which arrived in Korea in 372 AD, has thousands of temples built across the country.

Demographic features of the population of South Korea include population density, ethnicity, education level, health of the populace, economic status, religious affiliations, and other aspects of the population. The common language and especially race are viewed as important elements by South Koreans in terms of identity, more than citizenship.