Yebes Observatory (Spanish: Centro Astronómico de Yebes (CAY)) is an astronomical observatory located at Yebes, Castilla-La Mancha, Spain.

[1] Yebes Observatory is the main scientific and technical facility of the National Geographic Institute of Spain.

The facilities include two radio telescopes, a solar tower, an astrograph and a Gravimeter.

The most powerful telescope is the RT40 m telescope.