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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.

She later became the first first World Women's Champion for Mexican promotion Consejo Mundial de Lucha Libre (CMLL) in 1992, and in 1994, signed with World Wrestling Federation (WWF, now WWE). She won the WWF Women's Championship in a back-and-forth feud with Alundra Blayze, becoming the first Japanese wrestler recognized by the promotion to do so. After retiring from wrestling, Nakano began competing as a professional golfer, and in 2006, she joined a tour with the Ladies Professional Golf Association (LPGA). She was inducted into the Wrestling Observer Newsletter Hall of Fame on 2001 and was inducted into the WWE Hall of Fame in 2024.