Tajon Trevor Buchanan (তাজন ট্রেভর বুকানন) is a Canadian professional soccer player who plays for La Liga club Villarreal and the Canada national team. Known for his speed and technical ability, he usually plays as a wide midfielder, but can also be deployed as a full-back and a winger.

Buchanan was born and raised in Brampton, Ontario and is of Jamaican descent. His father died when Buchanan was seven years old. He began playing soccer with Brampton Youth, when he was eight. Buchanan won the 2014 IMG Cup with the Mississauga Falcons. At age 15, he moved with his best friend and his best friend's father (and his former coach), Chrys Chrysanthou, to Colorado where he joined the USSDA academy Real Colorado.

Buchanan spent two years playing college soccer at Syracuse University between 2017 and 2018, making 33 appearances, scoring 12 goals and tallying six assists. After two years with the Orange, Buchanan left early and signed a Generation Adidas contract with Major League Soccer ahead of the 2019 MLS SuperDraft.

Buchanan was named to the Canadian U-23 provisional roster for the 2020 CONCACAF Men's Olympic Qualifying Championship on February 26, 2020. A year later, he was named to the final squad for the rescheduled tournament on March 10, 2021. In Canada's opening match, Buchanan scored a brace in a 2–0 victory over El Salvador. He was named the 2020 Canada Soccer Youth International Player of the Year.

Buchanan accepted an invite for the Canada senior national team camp for January 2021. Buchanan was called up in June 2021 for the coming World Cup qualification matches against Aruba and Suriname, and subsequently made his senior-team debut against Aruba, setting up two goals in a 7–0 victory. On June 18, Buchanan was named to Canada's 60-man preliminary squad for the 2021 CONCACAF Gold Cup. On July 1 he was called up to the final 23-man squad. He scored his first goal for the senior team on July 29 against Mexico in the semi-final stage of the Gold Cup, netting the equalizer in an eventual 2–1 defeat. Buchanan's play at the tournament was widely praised by the region's media and at the conclusion of the competition he was named as the recipient of the 2021 CONCACAF Gold Cup Best Young Player Award.

In November 2022, Buchanan was named to Canada's squad for the 2022 FIFA World Cup. In Canada's second match on November 27 against Croatia, the team scored their first ever goal at a men's World Cup, with Buchanan sending in a cross that was met by the head of Alphonso Davies and sent into the back of the net.