Marnie McGuire (born 22 February 1969)[1] is a former New Zealand professional golfer who played mostly on the LPGA of Japan Tour.

McGuire won the British Ladies Amateur in 1986 as a 17-year-old and was at the time the youngest champion in the tournament's history.

[3] She played college golf at Oklahoma State where she was an All-American in 1990.

[4] While at Oklahoma State, she was diagnosed with malignant melanoma which led her to compete wearing long-sleeved shirts, a big floppy hat, and long slacks.

She is the only New Zealander to have won the Women's Australian Open, and the British Ladies Amateur.