The X-ray crystal structure of trans-dichlorobis(2,4,6-collidine) copper(II) has been determined. Dark blue crystals of the complex crystallize in the monoclinic space group P2(1)/c, with cell dimensions a=7.527(3), b=14.732(4), c=7.951(4)Angstrom and beta=92.79(9)degrees; V=880.6(6)Angstrom(3) and Z=2.949 unique reflections with I-net>sigma(I) on refinement afforded values of R=0.041 and R(w)=0.048.