  We compute the mass of the charm quark using both quenched and dynamical
lattice QCD calculations. We examine the effects of mass dependent lattice
artifacts by comparing two different formalisms for the heavy quarks. We take
the continuum limit of the charm mass in quenched QCD by extrapolating from
three different lattice spacings. At a fixed lattice spacing, the mass of the
charm quark is compared between quenched QCD and dynamical QCD with a sea quark
mass around strange. In the continuum limit of quenched QCD, we find
m_c(m_c)=1.29(7)(13) GeV. No evidence was seen for unquenching.
