Abstract : The most recent developments in the domain of new particle searches at LEP are reviewed. In particular, the updates of the searches for the standard model Higgs boson and for the Higgs bosons of the MSSM are summarized. A new method is proposed to derive a 95% C.L. limit on the standard model Higgs boson mass from the combinations of the analyses of the four LEP experiments. Finally, two monojet events from ALEPH with unexpectedly large transverse momenta and invariant masses are presented.