In this work the magnetic and structural properties of the Fe0.7–xMnxAl0.3 (0.00 ≤ x ≤ 0.30) alloy system, prepared by mechanical alloying are reported. The study was carried out, using X-ray diffraction (XRD), Mössbauer spectroscopy (MS) and vibrating sample magnetometry (VSM), in samples prepared by milling for 24, 48, 72 and 84 hours pure elements powders. X-ray data showed that, after milling, all the samples had a b.c.c. structure. The exception are those with x = 0.30, milled for 72 and 84 hours, which presented a mixture of b.c.c. and f.c.c. phases. The lattice parameters were, for each composition, nearly independent of the milling time and increase with x. The mean hyperfine fields of the different alloys, calculated from the fits of the Mössbauer spectra to a hyperfine field distribution (HFD), decreased monotonically with the increase of the Mn content and increased with the milling time. Similar results were obtained for the saturation magnetization dependence on the Mn content and milling times. These results allow to conclude that the increase in the Mn content produces a small lattice expansion and a weakening of the ferromagnetic character of the system. In contrast with this, the induction of disorder with the milling time enhances the ferromagnetic character of the samples.