Michigan-Dartmouth-MIT Observatory, Optical astronomy research center on Kitt Peak near Tucson, United States

The Michigan-Dartmouth-MIT Observatory is a research center on Kitt Peak near Tucson with two reflecting telescopes of different sizes. The Hiltner Telescope has a 2.4-meter aperture, while the McGraw-Hill Telescope measures 1.3 meters, and both are equipped for detailed celestial studies.

The McGraw-Hill Telescope was relocated from Ann Arbor to this site in 1975, marking the establishment of the location as a research facility. The Hiltner Telescope was added later and began operations in 1986.

The facility serves as a hub for astronomical collaboration between major universities, where students and researchers work together on celestial projects. This partnership has trained new generations of astronomers over the decades.

The observatory is a working research facility on Kitt Peak, not open to the public, so visits are arranged through the operating universities rather than on site. Its telescopes sit on the southwestern ridge of Kitt Peak, west of Tucson, Arizona, and the site is reached by the mountain road up Kitt Peak.

Asteroid 4432 McGraw-Hill, discovered on 2 March 1981 by Schelte J. Bus at Siding Spring, was named after the 1.3-meter telescope because that instrument provided the first physical observations of the minor planet. The IAU approved the name on 18 February 1992.