AGILE is a Small-Size ASI mission devoted to the study of sources in
the energy range 30 MeV - 30 GeV and 18 - 40 KeV and has already
completed three years of operations in orbit.
I will review the scientific results obtained so far on the study of
Galactic sources, blazars, gamma-ray bursts, super-novae remnants,
pulsars and pulsar wind nebulae, and terrestrial gamma-ray flashes. 
I will concentrate on the multi-wavelength campaigns performed in
conjunction with ground- and space-based observatories, obtained
thanks to the very fast dissemination of the gamma-ray analysis
results.