  I describe the latest D0 and CDF W boson mass measurements. The D0
measurement is performed with $4.3\, fb^{-1}$ of integrated luminosity in the
electron decay channel with a data set of $1.68\times 10^{6}$ W candidates. The
value of the W boson mass measured by D0 is $M_W = 80.375\pm 0.023\, GeV$ when
combined with the previously analyzed $1\, fb^{-1}$ of integrated luminosity.
The CDF measurement uses $2.2\, fb^{-1}$ of integrated luminosity in both
electron and muon decay channels with a total of $1.1\times 10^{6}$ W
candidates. The value of the W boson mass measured by CDF is $M_W = 80.387\pm
0.019\, GeV$. I report the combination of these two measurements with previous
Tevatron measurements and with the LEP measurements of the W boson mass. The
new world average is $M_W = 80.385\pm 0.015\, GeV$. I discuss the implications
of the new measurement to the indirect measurement of the Standard Model Higgs
boson mass.
