The Telescopio Nazionale Galileo (TNG), with a primary mirror of 3.58m, is the national facility of the Italian astronomical community, and is located at Roque de Los Muchachos Observatory (ORM).
It was operated by the Centro Galileo Galilei (CGG) which was created in 1997 by the Consorzio Nazionale per l'Astronomia e l'Astrofisica (CNAA). In 2002 it became a part of the Italian National Institute of Astrophysics (INAF) which is ensuring its financial support.
TNG is equipped with 3 instruments which are permanently operating on its foci and offer a large variety of observing modes covering the optical and near infrared wavelength ranges and spanning from broad band imaging to high resolution spectroscopy.
Observations at the TNG can be proposed through the Italian Time Allocation Commitee (TAC) which assigns, based solely on the scientif merit of the proposals, 75% of the available time. There is no restriction on the nationality of the proposers. Programs with P.I. and the majority of Co.I.'s from European Member States and Associated Countries other than Italy and Spain can take advantage from EU financial support through OPTICON. Calls for proposals are issued twice a year, typically in march and september.