Jeremy Shu-How Lin (Chinese: 林書豪; born August 23, 1988) is an American former professional basketball player. He unexpectedly led a winning turnaround with the New York Knicks of the National Basketball Association (NBA) during the 2011–12 season, sparking a cultural phenomenon known as "Linsanity". Lin is the first American of Chinese or Taiwanese descent to play in the NBA, and is one of the few Asian Americans to have played in the league. He is also the first Asian American player to win an NBA championship, having done so with the Toronto Raptors in 2019.

Born to a Taiwanese American family, Lin grew up in the San Francisco Bay Area and earned honors as a senior in high school. After receiving no athletic scholarship offers, he attended Harvard University, where he was a three-time all-conference player in the Ivy League. Undrafted out of college, Lin signed with his hometown Golden State Warriors in 2010. He seldom played in his rookie season and received assignments to the NBA Development League (now NBA G League). In 2011, Lin was waived by both the Warriors and the Houston Rockets before joining the New York Knicks early in 2011–12.

At first, Lin played sparingly for the Knicks, and he again spent time in the development league. In February 2012, however, he was promoted to the starting lineup and led the team on a seven-game winning streak. Lin's stellar play during the season helped the Knicks make the 2012 playoffs; it also catapulted him to international fame. Lin appeared on the covers of Sports Illustrated and Time and was named to the Time 100 as one of the most influential people in the world. In July 2012, Lin won the ESPY Award for Breakthrough Athlete of the Year.

Following his Knicks tenure, Lin played for the Houston Rockets, Los Angeles Lakers, Charlotte Hornets, Brooklyn Nets, Atlanta Hawks, and Toronto Raptors. While he experienced some success in Houston and Charlotte, he battled injuries in the ensuing seasons. In August 2019, he left the NBA and signed with the Beijing Ducks, where he became an All-Star in the Chinese Basketball Association (CBA). Attempting to return to the NBA, Lin played with the Warriors' development team in 2021. He returned to the CBA and played with the Ducks and later the Guangzhou Loong Lions. He left the Loong Lions midseason in 2022–23 and joined Kaohsiung 17LIVE Steelers of the P. League+ (PLG) in 2023. Lin would lead the PLG in assists that season. He signed with the New Taipei Kings in 2023, winning the PLG championship in 2024 and the Taiwan Professional Basketball League (TPBL) championship in 2025.

Lin was born to a Taiwanese American family in Torrance, California on August 23, 1988. He was raised a Christian in the Bay Area city of Palo Alto, California. His parents, Gie-ming Lin and Shirley Lin (née Xinxin Wu), emigrated from Taiwan to the United States in the mid-1970s, first settling in Virginia before moving to Indiana, where they both attended universities to study engineering and computer science. They are dual nationals of Taiwan and the U.S. Lin's paternal family are Hoklo people from Beidou, Changhua, Taiwan, while his maternal grandmother emigrated to Taiwan in the late 1940s from Pinghu, Zhejiang, in mainland China.

Lin's parents are both 5 feet 6 inches (1.68 m) tall. His maternal grandmother's family was tall, and her father was over 6 feet 0 inches (1.83 m). Lin has an older brother, Josh, and a younger brother, Joseph. Gie-Ming taught his sons to play basketball at the local YMCA. Shirley helped form a National Junior Basketball program in Palo Alto where Lin played. She worked with coaches to ensure his playing did not affect his academic performance. She was criticized by her friends for letting Lin play so much basketball, but let him play the game he enjoyed.

During his senior year in 2005–06, Lin captained Palo Alto High School—coached by 2006 Cal-Hi Sports State Coach of the Year Peter Diepenbrock—to a 32–1 record and upset the nationally ranked Mater Dei, 51–47, for the California Interscholastic Federation Division II state title. He was named first-team All-State and Northern California Division II Player of the Year, and ended his senior year averaging 15.1 points, 7.1 assists, 6.2 rebounds, and 5.0 steals.

Lin sent his résumé and a DVD of highlights of his high school basketball career to all of the Ivy League schools; the University of California, Berkeley; and his dream schools, Stanford University and the University of California, Los Angeles (UCLA). The Pac-10 (now Pac-12) schools wanted him to walk on rather than be actively recruited or offered an athletic scholarship. Harvard and Brown were the only teams that guaranteed him a spot on their teams, but Ivy League schools do not offer sports scholarships. University of San Francisco men's basketball coach and retired NBA player Rex Walters said NCAA limits on coaches' recruiting visits had reduced Lin's chances: "Most colleges start recruiting a guy in the first five minutes they see him because he runs really fast, jumps really high, does the quick, easy thing to evaluate".