W mass measurement

I describe the first measurement of the W boson mass at the LHC performed using 4.6 fb^-1 of proton-proton collision data recorded in 2011 at a centre-of-mass energy of 7 TeV with the ATLAS detector, as well as the W-like Z boson mass measurement performed by the CMS collaboration. The measured W boson mass in ATLAS is 80370+/-19 MeV, consistent with the Standard Model prediction and with the world average obtained from the combination of the LEP and Tevatron measurements. The ATLAS result is currently the most precise individual measurement of the W boson mass. The overview of the analyses is given with an emphasis on the ATLAS result.