Yona Walesi (born December 1, 1979) is a Malawian former swimmer, who specialized in sprint freestyle events.

He qualified for the men's 50 m freestyle, by receiving a Universality place from FINA in an entry time of 32.08.

[2] He challenged seven other swimmers in heat two, including 15-year-old Malique Williams of Antigua and Barbuda.

He rounded out the field to last place in 34.11, more than 12 seconds off the top-seeded time set by U.S. swimmer and defending Olympic champion Gary Hall, Jr. Walesi failed to advance into the semifinals, as he placed eighty-third overall out of 86 swimmers in the preliminaries.

His extensive coaching experience has led to him being appointed head coach of the Malawi National Swimming team in several large meets including the Commonwealth Games, Youth Commonwealth Games, and the Cana Zone 3&4.