  We review models of cosmological gamma-ray bursts (GRBs). The statistical and
$\gamma$-ray transparency issues are summarized. Neutron-star and black-hole
merger scenarios are described and estimates of merger rates are summarized. We
review the simple fireball models for GRBs and the recent work on non-simple
fireballs. Alternative cosmological models, including models where GRBs are
analogs of active galactic nuclei and where they are produced by high-field,
short period pulsars, are also mentioned. The value of neutrino astronomy to
solve the GRB puzzle is briefly reviewed.
