Illescas may refer to:
Places Illescas, San Luis Potosí, Mexico Illescas Peninsula, Peru Cerro Illescas, Peru Illescas, Toledo, a municipality in the province of Toledo, Castile-La Mancha, Spain Illescas, Florida, village in Uruguay Illescas, Lavalleja, village in Uruguay
People Fernando de Illescas (died 1419), Spanish Franciscan and diplomat Gonzalo de Illescas (bishop) (died 1464), Spanish monk and royal advisor Gonzalo de Illescas (historian) (1518–1583), Spanish historian Miguel Illescas (born 1965), Spanish chess Grandmaster
Sports CB Illescas, Spanish professional basketball team