Walter Sarnoi Oupathana (born June 23, 1986)[1] is a Lao-American professional boxer.

[2] Sarnoi was born to a Lao-descent family, his father was a professional boxer from Thailand who fought against Fighting Harada.

[4] In 2018, Sarnoi earned the WBC interim Latino silver featherweight title.

[5][3] In May 2021, Sarnoi competed at the 2021 Asian Amateur Boxing Championships representing Laos, the bout took place in the United Arab Emirates.

[6][7][8] In October 2021, Sarnoi competed at the 2021 AIBA World Boxing Championships in Belgrade, Serbia in the 60kg lightweight division representing The People’s Democratic Republic of Laos as the only representative competing for the country.