Hardy Pond
Hardy Pond Show map of Massachusetts Hardy Pond Show map of the United States
Location	Waltham, Massachusetts
Coordinates	42°24′26.53″N 71°14′38.26″W / 42.4073694°N 71.2439611°W / 42.4073694; -71.2439611
Basin countries	United States
Surface area	42 acres (17 ha)

Hardy Pond is a 45-acre (180,000 m²) pond located in Waltham, Massachusetts. Originally almost twice the size, in recent times the pond level was lowered in an inappropriate approach to controlling flooding. The quality of the water has degraded due to eutrophication caused by run-off from roads, fertilizers, and storm drain inputs. The pond is contiguous with 35 acres (140,000 m²) of adjoining wetlands. It is a popular site for bird sightings, with over 140 species listed.

• Hardy Pond Association was largely responsible for restoring the pond to a healthier state, raising funds for dredging and improvements to the storm sewer system.