  We explore the CP violation in the charged Higgs production associated with a
top quark at the LHC in the MSSM. The supersymmetric phases of gaugino masses
and trilinear $A$ terms lead to a CP violating asymmetry of the cross section
in the $ p p \to g b \to t H^\pm$ process through loop corrections to the
$tbH^\pm$ vertex. We find that a CP violation more than 10 % is possible if the
charged Higgs boson is heavy enough.
