Rare B decays at LHC

This paper gives an overview of the latest studies of LHCb, ATLAS, and CMS in rare-B sector. Flavour Changing Neutral Current involves b -> d or b -> s transitions occuring only from loop-level in the standard Model. They consequently provide en excellent probe of effects of New Physics. Within the Standard Model, these decays are sensitive to the CKM matrix elements Vts and Vtd. Some of these channels, like B -> K* gamma, have already been measured at B-factories. However, due to a very large bbbar production, the LHC will play a leading role i rare B-deacys studies. very promising sectors like B -> K* mu mu or B -> rho mu mu, will be extensively studied at LHC. Other rare channels, like B -> mu mu ot Bs-> phi gamma, could be observed for the first time at the LHC.