The Koch family (// KOKE) of industrialists and businessmen is most notable for its control of Koch Industries, the second largest privately owned company in the United States. The family business was started by Fred C. Koch, who developed a new cracking method for the refinement of heavy oil into gasoline. Fred's four sons litigated against each other over their interests in the business during the 1980s and 1990s.
David H. Koch and Charles G. Koch — the two brothers still with Koch Industries — are affiliated with the Koch family foundations. Annual revenues for Koch Industries have been "estimated to be a hundred billion dollars".
- Fred C. Koch (1900–1967), American chemical engineer and entrepreneur who founded the oil refinery firm that later became Koch Industries and was one of the founding members of the John Birch Society 
- Mary Robinson Koch (October 17, 1907–December 21, 1990), wife of Fred C. and namesake of the company tanker vessel Mary R. Koch
- Four sons of Fred C. and Mary Robinson Koch:
The Koch family foundations are related group of non-profit organizations that began with the establishment of the Fred and Mary Koch Foundation in 1953, and now includes the Charles Koch Foundation, the David H. Koch Charitable Foundation and the Koch Cultural Trust. The organizations collectively have a stated goal of "advancing liberty and freedom" through the support of various causes which further social progress and sustainable prosperity.
Members of the Koch family have given to conservative and libertarian policy and advocacy groups in the United States, including think tanks like the Heritage Foundation and the Cato Institute, and more recently Americans for Prosperity. Americans for Prosperity and FreedomWorks are organizations with links to both the Kochs and the Tea Party movement.
According to the Koch Family Foundations and Philanthropy website, "the foundations and the individual giving of Koch family members" have financially supported organizations "fostering entrepreneurship, education, human services, at-risk youth, arts and culture, and medical research." 
In 2011 the Koch Industries website was attacked by Anonymous following the Industries' attack upon union members, the result being their website could not be accessed for 15 minutes. In 2013 one member of the group, a 38-year-old truck driver, pleaded guilty when accused of participating in the attack for a period of one minute, and received a sentence of two years federal probation, and ordered to pay $183,000 restitution. 
- Barclays brothers
- Charles Koch Arena
- David H. Koch Institute for Integrative Cancer Research
- David H. Koch Theater
- The Science of Success, a book by Charles Koch in which he attributes the success of the family business to Market-Based Management
- "Forbes America's Largest Private Companies". Forbes.com. Retrieved 2011-10-04.
- Koch, Charles C. (2007). The Science of Success: How Market-Based Management Built the World's Largest Private Company. John Wiley & Sons, Inc. p. 6. ISBN 978-0-470-13988-2.
- "Koch Industries, Inc.". Company Profile Report. Hoover's, Inc. 2010. Retrieved 2010-05-10. "[W]hen he tried to market his invention, the major oil companies sued him for patent infringement. Koch eventually won the lawsuits (after 15 years in court), but the controversy made it tough to attract many US customers."
- "Epic struggle among Koch brothers ends". Houston Chronicle. May 26, 2001. p. 2.
- Mayer, Jane (August 10, 2010) http://www.newyorker.com/reporting/2010/08/30/100830fa_fact_mayer Covert Operations: The billionaire brothers who are waging a war against Obama The New Yorker
- Davis, Jonathan T. (1997). Forbes Richest People: The Forbes Annual Profile of the World's Wealthiest Men and Women. Wiley. p. 138. ISBN 978-0-471-17751-7. "Founding member (1958) John Birch Society — reportedly after seeing Russian friends liquidated"
- Hoover's 500: Profiles of America's Largest Business Enterprises. Hoover's Business Press. 1996. p. 286. ISBN 978-1-57311-009-9. "In 1929 Koch took his process to the Soviet Union, but he grew disenchanted with Stalinism and returned home to become a founding member of the anticommunist John Birch Society."
- Wayne, Leslie (7 December 1986). "Brothers at Odds.". The New York Times (NY). p. Sec. 6; Part 2, p 100 col. 1. ISSN 0362-4331. "He returned a fervent anti-Communist who would later become a founding member of the John Birch Society."
- Diamond, Sara (1995). Roads to Dominion: Right-Wing Movements and Political Power in the United States. NY: Guilford Press. p. 324 n. 86. ISBN 0-89862-862-8
- Fred and Mary Koch Foundation
- Koch Family Foundations. "Koch Family Foundations and Philanthropy". Retrieved 1 June 2013.
- Zernike, Kate (October 19, 2010). "Secretive Republican Donors Are Planning Ahead". New York Times.
- Charles Koch, in interview with Stephen Moore of the Wall Street Journal. May 6, 2006.
- Vogel, Kenneth P. (August 9, 2010), "Tea party's growing money problem", Politico, retrieved 2011-06-14
- Fenn, Peter (February 2, 2011), "Tea Party Funding Koch Brothers Emerge From Anonymity", U.S. News & World Report, retrieved 2011-06-13