Jiffy is a brand of baking mixes marketed by the Chelsea Milling Company in Chelsea, Michigan, that has been producing mixes since 1930. The company was previously named Chelsea Roller Mill. They are known for their products being packaged in a recognizable, small box with the brand's logo in blue. Jiffy was created as the first prepared baking mix in the United States by Mabel White Holmes.

The company is now run and managed by her grandson, Howdy Holmes, a former Indianapolis 500 and CART driver. Holmes became the company's CEO in 1995. In March 2013, the company had around 350 employees, and in 2015 employs about 300 workers and produces 1.6 million boxes of its products each day. Its corn muffin mix accounts for 91 percent of the company's retail sales, and the company's retail market in October 2013 was $550 million.