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The far‐infrared spectrum of MnFe2O4 reveals two prominent bands v1 and v2 and two weak bands v3 and v4 in the range 600 to 200 cm−1. The high frequency band (v1) and the low frequency band (v2) are assigned to tetrahedral and octahedral metal complexes, respectively. The spectra of the mixed Mn1–xMgxFe2O4, with x ranging from 0.25 to 0.9, also reveal four bands. Their position and intensity are found to be strongly dependent on the x‐value. On the basis of the analysis of the IR bands and their correlation with the cation distribution, the band v3 is assigned to octahedral divalent metal ion‐oxygen complex. The lowest frequency band (v4) position and its intensity increases with the x‐value and it is assigned to the lattice vibrations in the mixed ferrites.