Title: First Run II Measurement of the W Boson Mass with CDF


I present a new measurement of the W boson mass from the CDF Collaboration. With a total uncertainty of 48 MeV/c2, this is the single most precise W mass measurement to date. The world uncertainty on the W mass has been reduced from 29 MeV/c2 to 25 MeV/c2, further constraining the mass of the Higgs boson in the context of the Standard Model.