We present the results of the temperature dependence of the electrical resistivity, ρ of disordered Ni100−xMnx alloys (x=15–37) in the temperature range 5≤T≤350K. We find distinctly different behavior of ρ(T) below and above the multicritical point (x=25) recently found by us through detailed magnetic measurements in the same set of samples. In the ferromagnetic/ferro-spin-glass (x≤25) phase, ρ(T) is dominated by the ferro-spin-glass phase contribution below the glass transition temperature and above it by large electron–phonon and electron–magnon s–d scattering. In the spin-glass/antiferromagnetic regime (x≥25) resistivity minima show up due to larger disorder with resistivity ∼(150–185) μΩcm. Here ρ(T) is dominated by electron–electron interactions ∼−√T and electron–phonon s–d scattering.