Chen Kenichi (陳建一, Chin Ken'ichi^?, simplified Chinese: 陈建一; traditional Chinese: 陳建一; pinyin: Chén Jiànyī, born January 5, 1956 in Tokyo, Japan), whose name is often romanized Chin Kenichi in Japanese sources, is a Han Chinese chef best known for his role as the Iron Chef Chinese on the television series Iron Chef. He wears a yellow outfit and rises into Kitchen Stadium holding a cleaver in his hand. He is the only Iron Chef to have held his position throughout the life of the show. He was born in Japan to ethnic Han Chinese parents of Japanese nationality and his formal name is Ken'ichi Azuma (東 建一, Azuma Ken'ichi^?).

Chen is the son of Chen Kenmin, who is regarded as the father of Sichuan cuisine in Japan. Chen's special dish, "Prawns in Chili Sauce" (Ebi Chili), is an adaptation of a dish that his father had introduced to Japan. As a result, Chen is often compared to his father on the series, with some saying that Iron Chef helped the son exceed the skills of his father.

Chen originally accepted his position on Iron Chef out of the need for a challenge, although the format of the show had intrigued him. Despite the fact that he is the longest-serving Iron Chef and the only original Iron Chef, having been an Iron Chef for the series' six-year run, Chen had on several occasions considered leaving his position (among his reasons was the desire to tend to his restaurants, which had become booked every night since the show's beginning, as well as a bout of depression following the death of his mother). Ultimately, it was fellow Iron Chef Hiroyuki Sakai who convinced Chen to stay, with their agreement that should one leave the show, so would the other.