Casey Yu-jin Phair (Korean: 케이시 유진 페어;[2] born 29 June 2007) is a South Korean professional footballer who plays as a striker for National Women's Soccer League (NWSL) club Angel City FC and the South Korea national team.

She was the youngest player to ever feature in a FIFA Women's World Cup, having made her debut in the tournament in 2023 at the age of 16 years and 26 days old.

[3][4] A Korean American who was raised in New Jersey, United States, Phair was the first multiracial footballer to ever receive a call-up to the South Korea women's national team.

[13][14] In the process, she also became the youngest footballer to have reportedly won a cap for a women's senior national team, a record that was later broken by Una Rankić in September of the same year.

[16] On 26 October 2023, Phair scored her first senior goal, as well as her first hat-trick, in a 10–1 win over Thailand in the second round of the 2024 AFC Women's Olympic Qualifying Tournament:[17][18] in the process, at 16 years and 119 days of age, she became the second youngest goalscorer in the history of the South Korean women's senior national team,[17][18] behind only Ji So-yun.