The reconstruction and identification of hadronic objects has a wide variety of use-cases inside the physics program of the LHC, ranging from Standard Model measurements and Higgs searches up to the more exotic searches of boosted resonances. The CMS collaboration devoted a constant effort in improving such tools in order to extend the analyses reach.

A review of the current status of the identification algorithms for hadronic taus, heavy flavour jets, quark/gluon discrimination, and boosted resonances is presented together with their performance, either measured on data or expected from simulation.

Special attention is devoted to novel techniques recently introduced, and their impact on the final performance on the classification task.