Heavy Neutrino searches 
at ATLAS & CMS

Several theories beyond the Standard Model predict the existence of heavy neutrinos trying to explain the experimental evidence of neutrino masses and that they are much smaller than their charged lepton partners. Principle models are the Left-right symmetric models (LRSM) and the Neutrino Minimal Standard Model (\{nu}MSM), which can include the seesaw mechanism, in particular the Type I seesaw mechanism, which introduces new heavy neutrino states without additional vector bosons, or the Type III seesaw mechanism which introduces additional heavy lepton triplets. Latest searches for such heavy neutrinos performed with the ATLAS and CMS detectors will be presented using proton-proton data from the LHC at a \sqrt{s} of 13 TeV.