French's is an American brand of prepared mustard, condiments, fried onions, and other food items. French's is now owned by McCormick & Company, is an American food company that manufactures, markets, and distributes spices, seasoning mixes, condiments, and other flavoring products for the industrial, restaurant, institutional, and home markets.

About the brand's history, brothers Robert and George French bought a flour mill in 1883 in Fairport, New York. It burned down in 1884 and they relocated the flour mill to Rochester, New York. They named their mill the R.T. French Company. Robert French died in 1893 and brother George became company president. George (who developed the creamy yellow mustard) and another brother, Francis, introduced French's mustard in 1904.

In 1926, French's was sold to J. & J. Colman of the United Kingdom, a company that produced home care products such as Lysol, Reckitt's Blue and Brasso, and its own mustard brand, as well as other products such as Frank's RedHot condiment line.

French's had facilities in Shelley, Idaho, for potato products. A plant in Souderton, Pennsylvania, was constructed in 1957 and closed in the 1990s. A plant in Fresno, California, closed in 1994. Manufacturing operations were consolidated in Springfield, Missouri.

According to Statista, French’s is the best-selling mustard brand in the US, an estimated 148.23 million consumers in 2019.

According to Statista and en.wikipedia