Big Bay is an unincorporated community in Massac County, Illinois, United States. Big Bay is north of Metropolis.
Big Bay is located in a farming community, and its residents were said to raise nearly all their own food well into the 20th century. Big Bay was a significant timber shipping point on the Illinois Central Railroad, but damage from the 1937 flood caused the town to decline. By 1979 it consisted of "barely a dozen houses." Residents successfully pushed for the town to have an exit on Interstate 24 when that highway was built in the 1970s. Big Bay reportedly had a post office briefly in 1835.
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