Opus 40 is a large environmental sculpture in Saugerties, New York, created by sculptor and quarryman Harvey Fite (1903—1976).

It comprises a sprawling series of dry-stone ramps, pedestals and platforms covering 6.5 acres (2.6 ha) of a bluestone quarry.

As the rampwork of his open-air gallery expanded, Fite realized that the 1.5-ton (1.36 metric ton) statue, Flame, which had occupied the central pedestal, had become too small for the scale to which his work had grown, and he replaced it with a 9.5-ton bluestone pillar he had found in a nearby streambed, intent on carving it in place as his tallest bluestone sculpture to date.

[2] In the early 1970s, after he had retired in 1969 from 35 years as a professor at Bard College, Fite built the Quarryman's Museum on the grounds, a collection of folk tools and artifacts of the quarrying era.

Work stopped that day, leaving some areas unfinished—but, as his stepson, the writer Jonathan Richards, has observed, “Opus 40 is as complete as it ever would have been.