| Mario Guariña | |
| Office: | Senator of the Philippines from the 6th District |
| Term Start: | October 16, 1916 |
| Term End: | June 3, 1919 |
| Alongside: | Leoncio Imperial |
| Predecessor: | position established |
| Successor: | Vicente de Vera |
| Office2: | Member of the House of Representatives from Sorsogon's 2nd district |
| Term Start2: | June 2, 1925 |
| Term End2: | June 5, 1928 |
| Predecessor2: | Federico Jimenez |
| Successor2: | Francisco Arellano |
| Office3: | Governor of Sorsogon |
| Term Start3: | 1908 |
| Term End3: | 1912 |
| Predecessor3: | Bernardino Monreal |
| Successor3: | Victor Eco |
| Party: | Nacionalista |
| Birth Date: | 19 January 1876 |
| Birth Place: | Juban, Sorsogon, Captaincy General of the Philippines |
| Death Place: | Pasay, Rizal, Philippine Islands |
Mario Guariña y Guerrero (January 19, 1876 – October 8, 1935) was a Filipino lawyer and politician during the American occupation from Sorsogon.
Guariña was born in Juban, Sorsogon to Mariano Guariña and Maria Guerrero.[1] He received his Bachelor of Arts degree from the University of Santo Tomas and his Bachelor of Laws degree from the Escuela de Derecho.[2]
Guariña held several administrative positions such as Provincial Fiscal of Leyte and later, Batangas, as well as assistant director of the Bureau of Prisons.[1] [3]
In politics, he served as Governor of Sorsogon from 1908 to 1912. He was later elected to the newly established Philippine Senate as the first representative of the 6th District, comprising the Bicol region, from 1916 to 1919 and returned to the national legislature as representative for Sorsogon's 2nd district[1] in the House of Representatives from 1925 to 1928. He later served as a member of the 1934 Philippine Constitutional Convention representing Sorsogon.[2]
Guariña was married to Agueda Dia and had six children.[2]