吉 幾三（よし いくぞう、11月11日 - ）は、日本の歌手、シンガーソングライター。青森県北津軽郡金木町（現・五所川原市）出身。青森県在住。公式愛称はIKZO。本名は鎌田 善人（かまた よしひと）。血液型はB型。身長178cm、体重70kg。靴サイズ25.5cm。既婚。子供が3人おり、長女は歌手のKU（くー）。次女は女優の寿三美（ことぶき みみ）。長男は吉幾三のYouTubeチャンネルのクリエイター。
Ikuzo Yoshi (November 11, ) is a Japanese singer and singer-songwriter. He is from Kanagi Town, Kitatsugaru District, Aomori Prefecture (currently Goshogawara City). He lives in Aomori prefecture. His official nickname is IKZO. His real name is Yoshito Kamata. He has a blood type of B. He is 178 cm tall and weighs 70 kg. He has a shoe size of 25.5 cm. He is married. He has three children and his eldest daughter is singer KU. The second daughter is actress Mimi Kotobuki. His son is the creator of Ikuzo Yoshi's YouTube channel.