Fierro is a Spanish and Italian surname meaning "iron". Notable people with the surname include:
Daniel Fierro, Political consultantEric Fierro, Complex Litigation & Electronic Discovery AttorneyFanny Carrión de Fierro, Ecuadorian writer and literary critiqueGonzalo Fierro (born 1983), Chilean football playerJosefina Fierro de Bright (1914–1998), Mexican-American activistJuan Fierro (born 1974), Chilean road cyclistJulia Fierro (born 1976), Italian-American novelist and founder of The Sackett Street Writers' Workshop Luis Fierro (born 1964), Ecuadorian economist and social development specialistMartha Fierro (born 1977), Ecuadorian chess championMartin Fierro (saxophonist) (1942–2008), saxophonistRodolfo Fierro (1880–1915), General in the Pancho Villa army during the Mexican RevolutionRodrigo Fierro, Ecuadorian M.D., writer and politician, former Minister of Health of Ecuador.Aurelio Fierro (1923–2005), Italian actor and singerFictional characters:
Martín Fierro, a fictitious character in a poem by Argentine José Hernández