The asymmetric unit of the title compound, [Fe(C₈H₁₁N₂)(C₁₇H₁₄PS)], contains two independent molecules (A and B) with very similar conformations. Each molecule is built up from a ferrocene unit substituted in the 1 and 1′ positions by a protected sulfur diphenylphosphine and by a dimethylhydrazine, –C(H)=N—N(CH₃)₂, fragment. The two independent molecules are linked by a C—H...N hydrogen bond. In the crystal, the A–B dimer is linked by a pair of C—H...S hydrogen bonds, forming a centrosymmetric four-molecule arrangement. These units are linked by C—H...π interactions, forming a supramolecular three-dimensional structure.