William Patrick Zalatoris (born August 16, 1996) is an American professional golfer. He has competed primarily on the PGA Tour, where he has won once, at the 2022 FedEx St. Jude Championship. He also has three runner-up finishes in major championships.

Zalatoris was born in San Francisco, California on August 16, 1996, to Catherine and Richard Zalatoris. He was an only child. His parents worked in real estate. His mother was once a track and field athlete at the University of Oregon, specializing in middle-distance running.

Both of his parents were recreational golfers, and his mother continued to play golf while carrying him until three weeks before he was born. He received his first plastic club when he was 18 months old. He learned to play the game at Mariners Point Golf Center in Foster City, California. His parents belonged to California Golf Club, where Zalatoris played alongside his father. Also at Cal Club, he met 1964 U.S. Open champion Ken Venturi when he was six. Venturi gave him advice on his grip, although Zalatoris was unaware who Venturi was at the time.

At age nine, Zalatoris moved with his family to Texas. He grew up at Bent Tree Country Club in Dallas. He often competed against fellow Dallas-area golfers Jordan Spieth and Scottie Scheffler in junior tournaments. Zalatoris attended Trinity Christian Academy in Addison, Texas, where he was a four-year letterman. In June 2014, he won the Texas Amateur Championship. He won the Trans-Mississippi Amateur in July. Two weeks later, Zalatoris won the U.S. Junior Amateur. He defeated Davis Riley, 5 and 3, in the final.

Zalatoris had planned to attend Stanford University, but was offered the Arnold Palmer Scholarship by Jerry Haas to play for the Wake Forest Demon Deacons at Wake Forest University in North Carolina beginning in fall 2014. He majored in psychology. Zalatoris won his first individual collegiate title at the Bank of Tennessee Intercollegiate in October 2014, scoring 10-under to finish two strokes ahead of runner-up Denny McCarthy.

In September 2015, Zalatoris won his second collegiate title. He birdied the final hole to win the Rod Myers Invitational by one stroke. In July 2016, Zalatoris won the Trans-Mississippi Amateur for the second time, and the Pacific Coast Amateur. He was chosen to represent the United States at the 2016 Arnold Palmer Cup. He won medalist honors for the third time in his collegiate career at the General Hackler Championship in March 2017.

As a junior, Zalatoris was named ACC Player of the Year in 2017. He was also named All-ACC, First-Team GCAA All-American, First-Team Golfweek All-American, Ben Hogan Award semifinalist, and Jack Nicklaus Award finalist. He was selected as a member of the U.S. team in the 2017 Walker Cup, alongside future PGA Tour winners such as Collin Morikawa. Zalatoris left school after his junior year to turn professional. His collegiate scoring average was 70.44, which broke the Wake Forest record of 70.87 set by Bill Haas (2001–04).

Zalatoris decided in December 2017 to forego his final semester of university and turn professional at the start of 2018. He made six starts on the PGA Tour in 2018, making only one cut. Towards the end of 2018, Zalatoris competed in qualifying school for the Web.com Tour. He failed to advance past the first stage. With no status in 2019, he relied on Monday qualifying and sponsor exemptions to play on the Web.com Tour (later renamed the Korn Ferry Tour). Zalatoris secured membership for the remainder of the season after a third-place finish at the LECOM Health Challenge in July. He finished the regular season 60th in points, earning full status for the 2020 Korn Ferry Tour season.