Mitchell David Kapor is an American entrepreneur best known for his work as an application developer in the early days of the personal computer software industry, later founding Lotus, where he was instrumental in developing the Lotus 1-2-3 spreadsheet. He left Lotus in 1986. In 1990 with John Perry Barlow and John Gilmore, he co-founded the Electronic Frontier Foundation, and served as its chairman until 1994. In 2003, he became the founding chair of the Mozilla Foundation, creator of the open source web browser Firefox. Kapor has been an investor in the personal computing industry, and supporter of social causes via Kapor Capital and the Kapor Center. He serves on the board of SMASH, a non-profit founded by his wife, Freada Kapor Klein, to help underrepresented scholars hone their STEM knowledge while building personal networks and skills for careers in tech and the sciences.

Lotus Software was an American software company based in Massachusetts; it was sold to India's HCL Technologies in 2018.