Sergio Augusto Magaña Martínez (2 December 1949 – 25 December 2017) was a Mexican politician. He was a member with the Party of the Democratic Revolution (formerly to the Institutional Revolutionary Party). From 2014 to 2017, he served as Deputy of the LIX Legislature of the Mexican Congress as a plurinominal representative and as Senator of the LVI and LVII Legislatures.