Kane Stuart Williamson (কেন উইলিয়ামসন) is a New Zealand international cricketer and a former captain of the New Zealand national team. On 27 February 2023, Williamson became the all-time leading run-scorer for New Zealand in Test cricket. A right-handed batsman and an occasional off spin bowler, he is widely regarded as one of the world's best contemporary batsmen and one of the greatest New Zealand captains and batsmen of all time. He captained New Zealand to victory in the 2021 ICC World Test Championship final and to the finals of the 2019 Cricket World Cup and 2021 T20 World Cup. He was also a part of the New Zealand squad to finish as runners-up at the 2015 Cricket World Cup and the 2025 ICC Champions Trophy.

Williamson made his first-class cricket debut while still a schoolboy at Tauranga Boys' College, in December 2007. He made his U-19 debut against the touring Indian U-19 team the same year and was named captain of the New Zealand U-19 team for the 2008 U-19 Cricket World Cup. He made his international debut in 2010. Williamson has represented New Zealand at the 2011, 2015, 2019 and 2023 editions of the Cricket World Cup and 2012, 2014, 2016, 2021, 2022 and 2024 editions of the ICC World Twenty20. He made his full-time captaincy debut for New Zealand in the 2016 ICC World Twenty20 in India. He captained New Zealand at the 2019 Cricket World Cup, leading the team to the final and winning the Player of the Tournament award in the process. On 31 December 2020, he reached a Test batting rating of 890, surpassing Steve Smith and Joe Root as the number one ranked Test batsmen in the world. He was nominated for the Sir Garfield Sobers Award for ICC Male Cricketer of the Decade, and the award for Test cricketer of the decade. Ian Chappell and Martin Crowe have ranked Williamson among the top four Test cricket batsmen, along with Joe Root, Steve Smith, Virat Kohli of the current era.

Williamson was born on 8 August 1990 in Tauranga, in the Bay of Plenty region on the North Island of New Zealand. His father Brett was a sales representative who had played under-17 and club cricket in New Zealand and his mother Sandra had been a representative basketball player. He has a twin brother Logan, who is one minute younger than him. The brothers have three older sisters, Anna, Kylie and Sophie. All three were accomplished volleyball players, and Anna and Sophie were in New Zealand age group teams. Williamson's grandmother Joan Williamson-Orr served as mayor of Taupō. His first cousin Dane Cleaver has also played international cricket for New Zealand.

Williamson played senior representative cricket at the age of 14 and first-class cricket at 16. He attended Tauranga Boys' College from 2004 to 2008, where he was head boy in his final year. He was coached by Pacey Depina who described Williamson as having "a thirst to be phenomenal – but not at anyone else's expense." He reportedly scored 40 centuries before he left school.

Williamson was 17, when he led the New Zealand Under-19 team in the World Cup in Malaysia in 2008. New Zealand reached the semi-final, where they lost to the eventual champions India. On 24 March 2010, Williamson was named in the New Zealand Test squad for the second Test against Australia, but ultimately he did not play in the match.

Williamson made his One-Day International debut against India on 10 August 2010. He was dismissed for a 9th ball duck. In his second match, he was bowled by Angelo Mathews for a second ball duck. He scored his maiden ODI century against Bangladesh on 14 October 2010 in Dhaka and hence became the youngest centurion in New Zealand's cricket history. Due to his performance on the Bangladesh tour where New Zealand suffered a 4–0 whitewash, Williamson was selected in the New Zealand Test squad for the tour of India that followed.

As of March 2025, Williamson has scored 33 Test and 15 ODI centuries. His highest score in Test is 251 and 148 in ODIs. He is yet to score a century in T20Is, his highest in that format being 95.

He bowls and bats right handed but writes left handed. Williamson has three children, two daughters and a son with wife Sarah Raheem whom he first met in 2015. During the New Zealand vs Pakistan 2014 ODI series, Williamson donated his entire match fee for all five ODIs to the victims of the 2014 Peshawar school massacre.