Calvin Sam Barlow (May 13, 1856 – April 5, 1920) was a pioneer and politician of Tacoma, Washington. He was considered one of the most successful merchants of the city. In 1877, he came to Tacoma–a small village at the time–and opened its first butcher shop. Barlow successfully conducted the business for three years in partnership with his brother. Later, they founded the Tacoma Trading Company (later, C. S. Barlow & Sons) and started dealing in various building materials as well as manufacturing their own. In 1903, their company was one of the largest in the city, and one of the leading merchants. It was stated that the company supplied near three-fourths of the lime for all of the Tacoma buildings of that time. Over the years, Barlow became a highly esteemed Tacoma merchant.