  The search for new physics in top quark decays at the LHC is reviewed in this
paper. Results from ATLAS and CMS experiments on top quark decays within the
Standard Model are presented together with the measurements of the W boson
polarizations and the study of the structure of the Wtb vertex. As a natural
step forward, the experimental status on measurements sensitive to top quark
couplings to gauge bosons (\gamma, Z, W and H) is reviewed as well as possible
top quark decays Beyond the Standard Model (MSSM and FCNC).
