The Sandwich–Marseilles Manufacturing Building, also known as the Dwarfies/Breeders Supply Building, is a historic building located in Council Bluffs, Iowa, United States. This building was built by the Sandwich Manufacturing Company and the Marseilles Manufacturing Company in what is known as the Implement District, an industrial area south of the central business district that was home to farm implement manufacturers. The two-story section on the north side was completed in 1883, and the single-story addition on the south side was completed sometime between 1889 and 1891. Marseilles then occupied the addition while Sandwich remained in the original building. There was a shift from agricultural implements to food processing as the area's business interests began to diversify. Dwarfies Cor