What women player has won the most tennis major championships?

Margaret Court has won the most Women's Grand Slams with 24: Australian Open (1960 to 1966, 1969 to 1971 and 1973), French Open (1962, 1964, 1969, 1970 and 1973), Wimbledon (1963, 1965 and 1970) and US Open (1962, 1965, 1969, 1970 and 1973).

She has also won 19 Women's Doubles Grand Slams and 19 mixed doubles Grand Slams!