Roque de los Muchachos Observatory (Spanish: Observatorio del Roque de los Muchachos, ORM) is an astronomical observatory located in the municipality of Garafía on the island of La Palma in the Canary Islands, Spain.

The seeing statistics at ORM make it the second-best location for optical and infrared astronomy in the Northern Hemisphere, after Mauna Kea Observatory, Hawaii.

Other countries which became involved later include Germany, Italy, Norway, the Netherlands, Finland, Iceland, and the United States.

In 2016, the observatory was announced as the second-choice location for the Thirty Meter Telescope, in the event that the Mauna Kea site is not feasible.

Due to its location at an altitude of 2,223 metres (7,293 ft) and on the windward slope, the precipitation is much higher than that of the coastal areas.