Atthaya Thitikul (Thai: อาฒยา ฐิติกุล, RTGS: Atthaya Thitikun, pronounced [ʔàːt.tʰā.jāː tʰì(ʔ).tì(ʔ).kūn]; born 20 February 2003) is a Thai professional golfer who plays on the U.S.-based LPGA Tour and the Ladies European Tour. She is the youngest golfer ever to win a professional golf tournament at aged 14 years, 4 months and 19 days after winning the Ladies European Thailand Championship as an amateur on 9 July 2017. She was the number one ranked women's amateur golfer in the world for a total of 12 weeks, rising to the top on two occasions, the first time on 26 June 2019.