Best Buy Co., Inc. is an American multinational consumer electronics retailer headquartered in Richfield, Minnesota. Originally founded by Richard M. Schulze and James Wheeler in 1966 as an audio specialty store called Sound of Music, it was rebranded under its current name with an emphasis on consumer electronics in 1983.

Best Buy operates internationally in Canada, and formerly operated in China until February 2011 (when the faction was merged with Five Star) and in Mexico until December 2020 (due to the effects of the COVID-19 pandemic). The company also operated in Europe until 2012. Its subsidiaries include Geek Squad, Magnolia Audio Video, and Pacific Sales. Best Buy also operates the Best Buy Mobile and Insignia brands in North America, plus Five Star in China. Best Buy sells cellular phones from Verizon Wireless, AT&T Mobility, T-Mobile, Boost Mobile and Ting Mobile in the United States. In Canada, carriers include Bell Mobility, Rogers Wireless, Telus Mobility, their fighter brands, and competing smaller carriers, such as SaskTel.

Hubert Joly is executive chairman of Best Buy, having been succeeded as CEO by Corie Barry in June 2019. According to Yahoo! Finance, Best Buy is the largest specialty retailer in the United States consumer electronics retail industry. The company ranked number 72 in the 2018 Fortune 500 list of the largest United States corporations by total revenue.

On August 22, 1966, Richard M. Schulze and a business partner opened Sound of Music, an electronics store specializing in high fidelity stereos in St. Paul, Minnesota. Schulze financed the opening of his first store with his personal savings and a second mortgage he took out on his family's home. In 1967, Sound of Music acquired Kencraft Hi-Fi Company and Bergo Company. Sound of Music earned $1 million in revenue and made about $58,000 in profits in its first year. In 1969, Sound of Music had three stores and Schulze bought out his business partner.

Sound of Music operated nine stores throughout Minnesota by 1978. In 1981, the Roseville location, at the time the largest and most profitable Sound of Music store, was hit by a tornado. The store's roof was sheared off and showroom destroyed, but the storeroom was left intact. In response, Schulze decided to have a "Tornado Sale" of damaged and excess stock in the damaged store's parking lot. He poured the remainder of his marketing budget into advertising the sale, promising "best buys" on everything. Sound of Music made more money during the four-day sale than it did in a typical month.

In 1983, with seven stores and $10 million in annual sales, Sound of Music was renamed Best Buy Company, Inc. The company also expanded its product offerings to include home appliances and VCRs, in an attempt to expand beyond its then-core customer base of 15- to 18-year-old males. Later that year, Best Buy opened its first superstore in Burnsville, Minnesota. The Burnsville location featured a high-volume, low-price business model, which was borrowed partially from Schulze's successful Tornado Sale in 1981. In its first year, the Burnsville store out-performed all other Best Buy stores combined.

Best Buy was taken public in 1985, and two years later it debuted on the New York Stock Exchange. In 1988, Best Buy was in a price and location war with Detroit-based appliance chain Highland Superstores, and Schulze attempted to sell the company to Circuit City for US$30 million. Circuit City rejected the offer, claiming they could open a store in Minneapolis and "blow them away."

In 1988, the company introduced a new store concept dubbed "Concept II". Concept II replaced dimly lit industrial-style stores with brighter and more fashionably fixtured stores. Stores also began placing all stock on the sales floor rather than in a stock room, had fewer salespersons and provided more self-help product information for its customers. Best Buy also did away with commissioned salespeople. The commission-free sales environment "created a more relaxed shopping environment free of the high-pressure sales tactics used in other stores," but was unpopular with salespersons and suppliers. Upset that their products would no longer be pushed by salespeople, some suppliers such as Maytag, Whirlpool, and Sony stopped selling in Best Buy stores altogether. The suppliers returned after Best Buy's sales and revenue grew following the roll-out of Concept II.