Mario Guariña y Guerrero (January 19, 1876 – October 8, 1935) was a Filipino lawyer and politician during the American occupation from Sorsogon.

[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.

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.