Jeong Mong-ju (, Hanja:鄭夢周, 1337 - April 1392) was a Korean Goryo Dynasty politician, writer, poet and thinker. The last Prime Minister of Goryo Dynastys 1390 to 1392. He was murdered by Lee Bang-won (이방원) and Jo yeong-mu (조영무), in Sunjukkyo (선죽교). Another name was 'Mongran' (몽란, 夢蘭) and 'Mongryong' (몽룡, 夢龍), nickname was Poeun (포은, 圃隱). Best friends and rival of Jeong Do-jeon.