In the title compound, C(15)H(15)N(5)O(2)S(2), the phenyl rings make dihedral angles of 4.03 (4) and 9.77 (5)° with the plane defined by the central N-N-C-N-N atoms (r.m.s. deviation = 0.010 Å). The C-S-C-C torsion angles of the methyl-sulfanyl groups with their respective phenyl rings are -7.47 (13) and -72.07 (13)°. The shortest centroid-centroid distance of 3.707 Å occurs between the two π-systems N-N-C-N-N and the benzene ring in the diazene 1-position. The H atom bound to the N atom is involved in intra-molecular N-H⋯N and N-H⋯S contacts, while the nitro O atoms are involved in inter-molecular C-H⋯O contacts.