Naganuma affair is a case of Naganuma disposal over concession of Naganuma which occurred in Naganuma village, Inba Prefecture (present-day Naganuma, Narita City, Chiba Prefecture).
長沼事件（ながぬまじけん）とは印旛県長沼村（現・千葉県成田市長沼）で起きた、長沼の利権を巡る長沼下戻係争の事である。