The structure of the title compound, [Dy(C(8)H(22)B(4)Si(2))Cl(C(6)H(16)N(2))], reveals that a center of symmetry exists within the dimeric half-sandwich units. Within each half-sandwich, the Dy(III) ion is coordinated by the five-membered ring of the carborane, tetramethylethyl-enediamine and the chloride ion.