Winny Chepngetich Bii (born 27 December 2003) is a Kenyan track and field athlete.

She later trained in Miramas in France before joining Oklahoma State University.

[2] In 2022, she became the first Kenyan to qualify for the long jump at the World Athletics U20 Championships in Cali, Colombia.

[4] In January 2024, competing for Oklahoma State University, Bii set a new national record in the triple jump as she won the Arkansas Invitational at the Randal Tyson Indoor Centre, Fayetteville, Arkansas with a leap of 13.49 metres.

[5] In February 2024, she extended her own national triple jump record to 13.66 metres at the Big 12 Indoor Championships.