The dusky seaside sparrow (Ammospiza maritima nigrescens) was a non-migratory subspecies of the seaside sparrow, found in Florida in the natural salt marshes of Merritt Island and along the St. Johns River. The last definite known individual died on Walt Disney World's Discovery Island in 1987, and the subspecies was officially declared extinct in December 1990.

The dusky seaside sparrow was first categorized as a species in 1873, after its discovery on March 17, 1872, by Charles Johnson Maynard. Its dark coloration and distinct song are what separates it as a subspecies of other seaside sparrows. Found in the marshes of Florida's Atlantic Coast on Merritt Island and the upper St. Johns River, the dusky seaside sparrow was geographically isolated from other seaside sparrows. It was categorized as a subspecies in 1873. Even though the dusky's mitochondrial DNA is the same as the mitochondrial DNA of other seaside sparrow populations, DNA testing by itself does not demonstrate that its subspecies classification is undeserving. In 1981, only five dusky seaside sparrows remained, all being males. Conservation efforts were made by trying to breed the remaining duskies with Scott's seaside sparrows in order to create half dusky hybrid offspring. "Unfortunately, although the Fish and Wildlife Service initially supported the crossbreeding program, it withdrew its support due to Interior's hybrid policy". Due to only the males being left, even though duskies could be crossbred with other seaside sparrows, there would never be another pure dusky seaside sparrow again.

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