Bosara agassizi is a moth in the family Geometridae. It is endemic to the mainland Papua New Guinea with records from the Southern Highlands and (provisionally) Eastern Highlands Provinces at altitudes of about 1,600–1,600 m (5,200–5,300 ft) above sea level.

As with all species in the Bosara refusaria group, Bosara agassizi are small (forewing length about 6 mm (0.24 in)), brown to grey moths.

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