  I obtain the complex pole squared mass of the Z boson at full two-loop order
in the Standard Model in the pure MS-bar renormalization scheme. The input
parameters are the running gauge couplings, the top-quark Yukawa coupling, the
Higgs self-coupling, and the vacuum expectation value that minimizes the Landau
gauge effective potential. The effects of non-zero Goldstone boson mass are
resummed. Within a reasonable range of renormalization scale choices, the scale
dependence of the computed pole mass is found to be comparable to the current
experimental uncertainty, but the true theoretical error is likely somewhat
larger.
