Eric Reyes Buhain[1] (Tagalog: [buˈhaʔɪn];[2] born April 12, 1970)[3] is a Filipino politician and former competitive swimmer serving as the Representative for Batangas's 1st district since 2022.

Eric ventured into swimming not because he dreamed of winning an Olympic gold medal, but because of his doctor's advice to improve his lungs.

It was at this age that he got into the varsity swimming team of De La Salle Santiago Zobel School and vowed to win a gold medal in the sport.

[5] The oldest child of former Bacoor, Cavite municipal vice mayor Cecilia Reyes-Buhain, Eric finished his elementary and secondary education at the De La Salle Santiago Zobel School in Ayala Alabang.

[6] Buhain is the husband of Representative Eileen Ermita-Buhain of the 1st district of Batangas, and the son-in-law of former Executive Secretary Eduardo Ermita.

Buhain is the older sibling of Camille Buhain-Javier,[7] one of the three women-lawyers behind the Filipino YouTube channel, The Soshal Network.