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The dilation of the α-Fe lattice by manganese (0 to 2.4 at.%) has been determined by lattice parameter and density measurements at 25°C. The results may be described within experimental error by the linear expressions Q = QFe−0.0071 × (at.% Mn) g.cm−3 (density measurement) and a0 = aFe + 0.00067 × (at.% Mn) Å (X-ray measurement). The virtual absence of dilation at Mn contents below 0.6at.%, reported in two previous investigations, is suggested as having resulted from internal oxidation of Mn.