Mammoth Mart was a discount department store chain, located in the northeastern United States, primarily in the New England area.

The chain was founded by Max Coffman and Henry Gornstein in Framingham, Massachusetts in 1956,[1] and was something of a prototype for the large, downscale department store, selling housewares, hardware and clothing in stark, unfussy buildings, usually in suburban shopping center locations.

Other discount department store retailers like K-Mart, Zayre, and Bradlees would subsequently expand on this concept.

In March 1970 Mammoth Mart diversified their holdings by acquiring the eight-unit Boston Baby chain of juvenile merchandise stores, eventually expanding the division to fifteen stores.

The cost of liquidating Boston Baby, combined with the economic effects of the Energy Crisis of 1973, rising inflation, increased shrinkage and Phase IV of the Nixon Administration's program of Wage and Price Controls, forced the company to file for bankruptcy protection under Chapter XI of the Bankruptcy Act of 1898—one of the precursors (along with Chapter X of the 1898 Bankruptcy Act) of today's Chapter 11— on June 17, 1974.