Guerrerostrongylus is a genus of nematode worms. Species of Guerrerostrongylus infect mostly the digestive tract of sigmodontine and caviomorph rodents from South America. The genus is part of the subfamily Nippostrongylinae. Species include: * Guerrerostrongylus uruguayensis Sutton and Durette-Desset, 1991 (type-species) * Guerrerostrongylus zetta (Travassos, 1937) * Guerrerostrongylus gomesae Simões, dos Santos and Maldonado, 2012 * Guerrerostrongylus ulysi Digiani, Notarnicola, and Navone, 2012 * Guerrerostrongylus marginalis Weirich, Catzeflis, and Jiménez, 2016