  Dark Matter (DM) detection prospects at future e+e- colliders are reviewed
under the assumption that DM particles are fermions of the Majorana or Dirac
type. Although the discussion is quite general, one will keep in mind the
recently proposed candidate based on an excess of energetic photons observed in
the center of our Galaxy with the Fermi-LAT satellite. If one assume that DM
couples to a Zprime, using radiative return events e+e-->XX+photon, one could
observe a spectacular signal at a TeV e+e- collider. This result relies on the
ability of using highly polarized beams to eliminate a large part of the W
exchange background. Prospects of discovery at LHC using mono-jets are also
discussed and appear promising. In the second part, one assumes that DM
particles annihilate through Higgs particles, either the SM boson h or MSSM
type bosons called H, A. A promising scenario emerges, where one has e+e-->HA,
with H decaying into hh, while A decays invisibly in most of the cases.
