Mitsuo Terada (寺田光男, Terada Mitsuo, born October 29, 1968), known professionally as Tsunku (つんく♂), is a Japanese singer, record producer, and songwriter. He was the lead singer of the rock band Sharam Q.

As a songwriter, Tsunku is the primary producer for Morning Musume and other Hello! Project acts, such as Coconuts Musume, Berryz Kobo, Cute, V-u-den, Aya Matsuura, and Maki Goto. He has also produced music for artists such as EE Jump and Sonim. Aside from musical acts, Tsunku has also produced soundtracks for anime and video game series such as Rhythm Heaven and ClassicaLoid. The total sales of the singles he has written exceed 37.9 million copies, making him the fifth best-selling lyricist in Japan.