  We summarize the activities of the New Particles Subgroup at the 1996
Snowmass Workshop. We present the expectations for discovery or exclusion of
leptoquarks at hadron and lepton colliders in the pair production and single
production modes. The indirect detection of a scalar lepton quark at polarized
$e^+e^-$ and $\mu^+\mu^-$ colliders is discussed. The discovery prospects for
particles with two units of lepton number is discussed. We summarize the
analysis of the single production of neutral heavy leptons at lepton colliders.
