Esther San Miguel Busto (born May 5, 1975 in Burgos) is a Spanish judoka. She has won six national titles and two European titles for the half-heavyweight division (78 kg). She is also a bronze medalist at the 2003 World Judo Championships in Osaka, Japan, and has captured a total of twenty-seven World Cup medals, including eight golds. San Miguel is a member of Centro de Alto Rendimiento Madrid Judo Club, and is coached by Sacramento Moyano.