Electroweak penguin B decays at Belle

We summarise the most recent results of the Belle experiment about flavour changing neutral current (FCNC) radiative and (semi-) leptonic B decays. In particular, we report about the first observation of the decays B → K*+−, B → φKγ, the inclusive B → Xs+−. We also report about searches for B → +− decay and for CP asymmetries in B → K*γ. PACS: 13.20.He – 13.40.Hq – 14.40.Nd – 12.15.Ji – 14.65.Fy – 11.30.Hv. © 2003, Springer-Verlag, Società Italiana di Fisica.