The Chengdu J-20 (Chinese: 歼-20; pinyin: Jiān-Èrlíng), also known as Mighty Dragon (Chinese: 威龙; pinyin: Wēilóng,^[9][10][11] NATO reporting name: Fagin)^[12] is a twinjet all-weather stealth^[13] fighter aircraft developed by China's Chengdu Aerospace Corporation for the People's Liberation Army Air Force (PLAAF).^[5] The J-20 is designed as an air superiority fighter with precision strike capability.^[14] The aircraft has three variants: the initial production model J-20A, the thrust-vectoring J-20B, and twin-seat aircraft teaming capable J-20S.

Descending from the J-XX program of the 1990s,^[15] the aircraft made its maiden flight on 11 January 2011,^[1][2] and was officially revealed at the 2016 China International Aviation & Aerospace Exhibition.^[16] The aircraft entered service in March 2017^[5] with the first J-20 combat unit formed in February 2018,^[5] making China the second country in the world and the first in Asia to field an operational stealth aircraft.^[17] The J-20 is the world's third operational fifth-generation fighter aircraft after the American F-22 and F-35.^[17]