Noguchi (野口 lit. "field entrance") is a Japanese surname. Notable people with the surname include:
Fujio Noguchi (野口富士男), novelist
Goro Noguchi (野口五郎), singer and actor
Haruchika Noguchi (野口晴哉), the founder of Seitai
Hideyo Noguchi (野口英世), bacteriologist, discoverer of the agent of syphilis
Hiroshi Noguchi (野口裕司), football player
Isamu Noguchi (野口勇), Japanese-American sculptor
Jiro Noguchi (野口二郎), baseball player
Ken Noguchi (野口健), alpinist
Kenji Noguchi (野口健司), member of the Shinsengumi
Koji Noguchi (野口幸司), football player
Osamu Noguchi (野口修), founder of Japanese kickboxing
Shigeki Noguchi (野口茂樹), baseball player
Shitagau Noguchi (野口遵), businesspeople
Soichi Noguchi (野口晴哉), astronaut
Thomas Noguchi (トーマス野口), Japanese-American coroner for Los Angeles County
Toshihiro Noguchi (野口寿浩), baseball player
Masaaki Noguchi (野口正明), baseball player
Mika Noguchi (野口美佳), businesswoman
Mizuki Noguchi (野口みずき), athlete
Neisai Noguchi (野口寧斎), poet
Nawoko Noguchi, also known as Naoko Ken (研ナオコ), singer, actress and television personality
Ryu Noguchi (野口竜), manga artist and designer
Ujo Noguchi (野口雨情), author
Yasutada Noguchi (野口安忠), athlete
Yataro Noguchi (野口弥太郎), painter
Yone Noguchi (野口米次郎), poet and father of Isamu Noguchi
Yoshiyuki Noguchi (野口祥順), baseball player
Yukio Noguchi (野口悠紀雄), economist