Iwabuchi (written: 岩渕 or 岩淵) is a Japanese surname. Notable people with the surname include:
Isao Iwabuchi (岩淵 功, born 1933), Japanese tennis player
Kensuke Iwabuchi (岩渕 健輔, born 1975), Japanese rugby union player and coach
Mana Iwabuchi (岩渕 真奈, born 1993), Japanese women's footballer
Ryota Iwabuchi (岩渕 良太, born 1990), Japanese footballer
Sanji Iwabuchi (岩淵 三次, 1895–1945), Imperial Japanese Navy admiral
Satoshi Iwabuchi (岩渕 聡, born 1975), Japanese tennis player
Yumi Iwabuchi (岩渕 有美, born 1979), Japanese softball player