| Eileen Ermita-Buhain | |
| Office: | Member of the Philippine House of Representatives from Batangas' 1st district |
| Term Start: | June 30, 2013 |
| Term End: | June 30, 2022 |
| Predecessor: | Tomas Apacible |
| Successor: | Eric Buhain |
| Term Start2: | June 30, 2001 |
| Term End2: | June 30, 2010 |
| Predecessor2: | Eduardo Ermita |
| Successor2: | Tomas Apacible |
| Birth Name: | Ma. Elenita Milagros Ramos Ermita |
| Birth Date: | 12 May 1969 |
| Education: | De La Salle University (AB) |
| Party: | Nacionalista (2009 - present) |
| Otherparty: | Lakas–CMD (2000 - 2009) |
Ma. Elenita Milagros Ramos Ermita-Buhain (born May 12, 1969), more commonly known as Eileen Ermita-Buhain, is a Filipino politician who served as a member of the House of Representatives of the Philippines, representing the 1st district of Batangas from 2013 to 2022 and previously from 2001 to 2010. She is a member of the Nacionalista Party.
Ermita-Buhain is married to the swimmer and former Olympian Eric Buhain, incumbent representative of the 1st district of Batangas and former chairman of the Games and Amusement Board. She is the daughter of Eduardo Ermita, who served as the Executive Secretary under President Gloria Macapagal Arroyo from 2004 to 2010.