  Novae are now firmly established as a high-energy (>100 MeV) gamma-ray source
class by the Fermi Large Area Telescope (LAT). In symbiotic binary systems such
as V407 Cyg 2010, there is a firm theoretical framework for the production of
shock-accelerated particles in the nova ejecta from interactions with the dense
wind of the red giant companion. Yet, the high-energy gamma-ray emission
detected in classical novae involving less evolved stellar companions cannot be
explained in the same way and could instead be produced in internal shocks in
the ejecta. We summarize the Fermi-LAT gamma-ray observations of novae,
highlighting the main properties that will guide further studies. Additionally,
we report on the soft gamma-ray (~0.1 MeV) continuum detection of the
oxygen-neon type classical nova V382 Vel 1999 with the OSSE detector aboard the
Compton Gamma Ray Observatory in light of its Fermi-era analog, V959 Mon 2012.
