Pak Se Ri (Korean: 박세리, also 朴世莉; born 28 September 1977) is a South Korean professional golfer, playing on the LPGA Tour. She was inducted into the World Golf Hall of Fame in November 2007.
Pak turned professional in 1996, a year before she moved to the United States as a 20-year-old. In 1996 and 1997, she won six tournaments on the LPGA of Korea Tour. Pak joined the LPGA Tour full-time for the year 1998, crowning her rookie season with victories in two majors: the McDonald's LPGA Championship and U.S. Women's Open. At just 20 years of age, she became the youngest-ever winner of U.S. Women's Open. Pak won a 20-hole playoff for that victory, making that tournament - at 92 holes in length - the longest tournament ever in women's professional golf. Four days after the U.S. Women's Open win, Pak shot a then-LPGA record 61 during the second round of the Jamie Farr Kroger Classic. She won the Rolex Rookie of the Year award for that season.
Since 1998, she has gone on to win 21 more events on the Tour, including three more majors. In June 2007, at age 29, she qualified for the World Golf Hall of Fame, surpassing Karrie Webb as the youngest living entrant ever. (Tom Morris, Jr., who died in 1875 at the age of 24, had been elected in 1975.)