Keiko Aoki (née Nakano; born January 8, 1968) is a Japanese retired professional wrestler and professional golfer, best known under the ring name Bull Nakano and for her tenures with All Japan Women's Pro-Wrestling (AJW). She held several championships for AJW, most notably a nearly three-year reign as WWWA World Single Champion, before being phased out by the company in the early 1990s due to their age-based personnel policies.