David A. Wheeler (born 1965) is a computer scientist. He works on open source software, free-libre software, and computer security.
In 2001, Wheeler published a study arguing that it would cost more than a billion United StatesUnited States dollars to develop Red Hat Linux—a FOSS—by conventional proprietary means. As part of his methodology, he measured the source lines of code of the operating system and applied conventional cost-estimating techniques. The work inspired one person to measure other FOSS systems, such as the Debian distribution.