Maschaug Pond is a coastal lagoon in Westerly, Washington County, Rhode Island, United States.

[2] A "small, brackish pond",[1] it is not permanently connected to the Block Island Sound, and is largely bordered by the Misquamicut Club golf course.

[3] Nests of the piping plover, which has been federally designated as a threatened species, have been documented within the watershed.

The pond averages 6.89 ft (2.10 m) deep, and has a salinity level of approximately 7 parts per thousand, too low to sustain the growth of eelgrass.

[7] As a result of certain environmental conditions, including low elevation of surrounding land and dense residential and commercial development, Maschaug Pond is considered particularly susceptible to storm surge.