Seon or Sŏn Buddhism is the Korean name for Chan Buddhism, a branch of Mahāyāna Buddhism commonly known in English as Zen Buddhism. Seon is the Sino-Korean pronunciation of Chan an abbreviation of 禪那 (chánnà), which is a Chinese transliteration of the Sanskrit word of dhyāna ("meditation"). Seon Buddhism, represented chiefly by the Jogye and Taego orders, is the most common type of Buddhism found in Korea.

Chan, from Sanskrit dhyāna, is a Chinese school of Mahāyāna Buddhism. It developed in China from the 6th century CE onwards, becoming especially popular during the Tang and Song dynasties.