Big Bay is an unincorporated community in Marquette County of the U.S. state of Michigan.

It is a census-designated place (CDP) for statistical purposes and does not have any legal status as an incorporated municipality.

The community is located within Powell Township near the shore of Big Bay on Lake Superior.

Although the Big Bay community is served by the Marquette ZIP code 49855,[5] the Big Bay post office with ZIP code 49808, serves a much larger area to the west and south of the community and CDP, including portions of Powell Township as well as Ishpeming, Champion, Michigamme, and Ely townships.

Filming took place at the Thunder Bay Inn, the Big Bay Lighthouse Bed and Breakfast, the Lumberjack Tavern (scene of the real 1952 crime on which the film is based), Perkins Park Campground, and various other locales.

It is a year-round, non-profit wellness camp for children and adults with physical disabilities.