A heat-resistant galvanized iron alloy wire is disclosed. The wire is comprised of an iron alloy wire core which may be an Fe-Ni type alloy. The core is coated on its periphery with a Zn-Al alloy. The alloy is comprised of 0.2 to 1.0 wt % Al with the balance being Zn, provided that Pb is present in an amount of less than 0.05 wt % and Sb is present in an amount of less than 0.02 wt %. The Zn-Al alloy may contain small amounts of typical impurities or compounds included in order to prevent the oxidation of the Zn or Al. The resulting wire has excellent heat-resistant properties.