Mitchell David Kapor (born 1 November 1950) is the founder of Lotus Development Corporation and the designer of Lotus 1-2-3. He is also a co-founder of the Electronic Frontier Foundation and was the first chair of the Mozilla Foundation. He has been involved in a number of other Internet-oriented organizations.

Kapor was born in Brooklyn, New York, and attended public schools on Long Island in Freeport, New York, where he graduated from high school in 1967. In 1966, he studied astronomy at the Summer Science Program. He received a Bachelor of Arts from Yale University in 1971 and studied psychology, linguistics and computer science as part of an interdisciplinary major in cybernetics. Kapor served as Music Director and Program Director at Yale's radio station WYBC-FM.

During the 1970s, Kapor was employed as a radio disc jockey at WHCN-FM, a commercial progressive rock station based in Hartford, Connecticut. It was also in this period that he became interested in Transcendental Meditation, going on to teach it in Cambridge, Massachusetts (where he also worked as a low-level computer programmer) and Fairfield, Iowa. In 1978, he graduated with a master's degree in psychology from Campus-Free College (later renamed Beacon College) in Boston. Kapor subsequently began a career as a mental health counselor at New England Memorial Hospital in Stoneham, Massachusetts.

In 1980, Kapor left his counseling career to attend the Master's of Science in Management program at the Massachusetts Institute of Technology's Sloan School of Management, but did not graduate.

He is married to Freada Kapor Klein and resides in San Francisco. Both served on the Board of Trustees of the Summer Science Program from 2004 to 2006. He was a student of the program in 1966. He is allergic to cats and gluten.