  We present the complete bosonic contributions to the effective weak mixing
angle, $\seff$, at the two-loop level in the electroweak interactions. We find
their size to be about three times smaller than inferred from simple estimates
from lower orders. In particular, for a Higgs boson mass, $M_H$, of 100 GeV
they amount to $4 \times 10^{-6}$, and drop down by about an order of magnitude
for $M_H = 200$ GeV. We estimate the intrinsic error of the theory prediction
of $\seff$ to be $4.7 \times 10^{-5}$.
