  These proceedings present the LHCb results on Majorana neutrino searches and
direct production of exotic particles using the data collected during Run I of
LHC. For the former, Majorana neutrinos are searched for both on-shell and
off-shell in $B$ and $D$ decays to final states with two same-sign muons. For
the latter, different types of new particles are studied profiting the unique
coverage of LHCb with respect to other detectors.
