Choe Sejin (Korean: 최세진; Hanja: 崔世珍; Korean pronunciation: [t͡ɕʰwe̞ sʰed͡ʑin]; 1465 – February 10, 1542) was a Korean linguist, and a translator and interpreter of the Chinese language during the Joseon Dynasty. He is of the Goesan Choe clan and his courtesy name was Gongseo (공서; 公瑞).[1] He is widely known for his research with the Korean hangul letters, and comparative studies with Chinese and Korean, which further led to the propagation of hangul during a time period when Hanja was dominant.