SkyMapper is a fully automated 1.35 m (4.4 ft) wide-angle optical telescope at Siding Spring Observatory in northern New South Wales, Australia.

It is one of the telescopes of the Research School of Astronomy and Astrophysics of the Australian National University (ANU).

The telescope has a compact modified Cassegrain design with a large 0.69 m secondary mirror, which gives it a very wide field of view: its single, dedicated instrument, a 268-million pixel imaging camera, can photograph 5.7 square degrees of sky.

It was inaugurated by Minister Kim Carr and Governor of New South Wales Marie Bashir in 2009.

[7] The stars, galaxies and asteroids observed in the survey (expected to be about a billion) will be extracted from each image and made publicly available via an Internet query form.