Chet Thomas Holmgren (/ˈtʃɛt ˈhoʊmɡrən/ CHET HOHM-grən; born May 1, 2002) is an American professional basketball player for the Oklahoma City Thunder of the National Basketball Association (NBA). A consensus five-star recruit and the top-ranked player of the 2021 class, Holmgren played college basketball for the Gonzaga Bulldogs and was drafted second overall by the Thunder in the 2022 NBA draft. After missing the 2022–23 season due to an offseason injury, Holmgren returned to earn NBA All-Rookie First Team honors in 2024. In his second season, his team won the 2025 NBA Finals. Holmgren was selected as an All-Star for the first time in 2026. Holmgren stands 7 ft 1 in (2.16 m) and plays the center and power forward positions.

Holmgren was born on May 1, 2002, in Minneapolis, Minnesota. He grew up playing basketball under the tutelage of his father, Dave Holmgren, who stands 7 ft 0 in (2.13 m) tall and played college basketball for the University of Minnesota from 1984 to 1988. In sixth grade, Holmgren began attending Minnehaha Academy, a Christian private school in Minneapolis. He stood 6 ft 2 in (1.88 m) at the time and was teammates with current Orlando Magic guard Jalen Suggs, whom he played alongside through high school. Holmgren improved his shooting range while recovering from a broken right wrist during his first season. By ninth grade, he had grown to 6 ft 9 in (2.06 m).

As a freshman at Minnehaha Academy, Holmgren averaged 6.2 points and three rebounds per game. His team won its second straight Class 2A state championship. In his sophomore season, Holmgren averaged 18.6 points and 11 rebounds per game and led his team to another Class 2A state title. After the season, he had success with his Amateur Athletic Union team Grassroots Sizzle at the Under Armour Association, earning tournament most valuable player honors. As a result, he emerged as one of the highest ranked players in the 2021 class and started receiving more NCAA Division I interest. In August 2019, Holmgren attracted national attention for crossing over NBA superstar Stephen Curry at Curry's own SC30 Select Camp.

On January 4, 2020, as a junior, Holmgren recorded nine points, 10 rebounds, and 12 blocks in a nationally televised victory over Sierra Canyon School, a nationally ranked team featuring Bronny James, Brandon Boston Jr., and Ziaire Williams. In his junior season, he averaged 14.3 points per game, leading Minnehaha to a 25–3 record.

As a senior, averaging 21 points and 12.3 rebounds, Holmgren won the Class 3A state title, his fourth state championship at Minnehaha. He was named Mr. Basketball USA, Gatorade National Player of the Year, Naismith Prep Player of the Year, Morgan Wootten National Player of the Year, a McDonald's All-American, and Minnesota Mr. Basketball.

Entering his junior season, Holmgren had about 30 scholarship offers from college basketball programs. In June 2020, after the reclassification of Jonathan Kuminga, he became the number one player in the 2021 class, according to ESPN. On April 19, 2021, Holmgren announced his commitment and signed a National Letter of Intent to play college basketball for Gonzaga, following his former high school teammate Jalen Suggs.

In his college debut, Holmgren tallied 14 points, 13 rebounds, seven blocks, and six assists in a 97–63 victory over Dixie State. He became the first player in 25 years to record at least 10 points, 10 rebounds, five assists, and five blocks in his debut. On November 22, the seven-foot freshman finished with 19 points on 7-of-9 shooting and 3 for 3 at the free-throw line. At the conclusion of the regular season, Holmgren was named West Coast Conference Defensive Player of the Year and Newcomer of the Year. At the NCAA tournament, Holmgren recorded 19 points, 17 rebounds, seven blocks and five assists in their 93–72 opening-round victory over Georgia State. As a freshman, he averaged 14.1 points, 9.9 rebounds, and 3.7 blocks per game.

On April 21, 2022, Holmgren declared for the 2022 NBA draft, forgoing his remaining college eligibility.