Charles Thomas Munger (born January 1, 1924, in Omaha, Nebraska) is an American business magnate, lawyer, investor, and philanthropist. He is Vice-Chairman of Berkshire Hathaway Corporation, the diversified investment corporation chaired by Warren Buffett; in that capacity, Buffett describes Munger as "my partner." Munger served as chairman of Wesco Financial Corporation from 1984 through 2011 (Wesco was approximately 80%-owned by Berkshire-Hathaway during that time). He is also the chairman of the Daily Journal Corporation, based in Los Angeles, California, and a director of Costco Wholesale Corporation.

Like Buffett, Munger is a native of Omaha, Nebraska. After studies in mathematics at the University of Michigan, and service in the U.S. Army Air Corps as a meteorologist, trained at Caltech, he entered Harvard Law School, where he was a member of the Harvard Legal Aid Bureau, without an undergraduate degree. Graduating in 1948 with a Juris Doctor magna cum laude, he, his wife, Nancy, and their son and two daughters moved to California where he joined the law firm Wright & Garrett (later Musick, Peeler & Garrett).In 1962, he founded and worked as a real estate attorney at Munger, Tolles & Olson LLP.He then gave up the practice of law to concentrate on managing investments. He partnered with Otis Booth in real estate development. He partnered with Jack Wheeler to form Wheeler, Munger, and Company, an investment firm with a seat on thePacific Coast Stock Exchange. He wound up Wheeler, Munger in 1976 after losses of 31% in 1973 and 1974.

Although Munger is better known for his association with Warren Buffett, he ran an investment partnership of his own from 1962 to 1975. According to Buffett's essay, "The Superinvestors of Graham-and-Doddsville," published in 1984, Munger's investment partnership generated compound annual returns of 19.8% during the 1962–75 period compared to a 5.0% annual appreciation rate for the Dow.

Munger was previously also the chairman of Wesco Financial Corporation, now a wholly owned subsidiary of Berkshire Hathaway. It began as asavings and loan association, but eventually grew to control Precision Steel Corp., CORT Furniture Leasing, Kansas Bankers Surety Company, and other ventures. Wesco Financial also held a concentrated equity portfolio of over $1.5 billion dollars in companies such as Coca-Cola, Wells Fargo, Procter & Gamble, Kraft Foods, US Bancorp, and Goldman Sachs. Munger believes that holding a concentrated number of stocks, that he knows extremely well, will in the long term produce superior returns. Wesco is based in Pasadena, California, Munger's adopted hometown. Pasadena was also the site of the company's annual shareholders' meeting, which were typically held on the Wednesday or Thursday after the more famous Berkshire Hathaway annual meeting. Munger's meetings were nearly as legendary in the investment community as those he co-hosts with Buffett in Omaha. Such meetings were often perfunctory, but Munger interacted with the other Wesco shareholders at considerable length, sometimes speculating about what his hero Benjamin Franklin would do in a given situation.Meeting notes are taken and posted on the internet.

Buffett has often publicly stated that he regards Munger as his partner. However, there are some major differences between the two men: Munger is known to be a Republican, whereas Buffett has generally supported Democrats. Buffett devotes his time almost exclusively to his business, while Munger, who does not involve himself in the day-to-day operations of Berkshire, is a generalist for whom investment is only one of a broad range of interests.