Recent theoretical and experimental improvements in the determination of charm and bottom quark masses are discussed. The final results, $m_c(3\,\text{GeV})=986(13)\,$MeV and $m_b(m_b)=4163(16)\,$MeV represent, together with a closely related lattice determination $m_c(3\;{\rm GeV})=986(10)\,$MeV, the presently most precise determinations of these two fundamental Standard Model parameters. A critical analysis of the theoretical and experimental uncertainties
is presented.
