David Heinemeier Hansson (born 15 October 1979; known to the Ruby and ALMS communities as DHH) is a Danishprogrammer and the creator of the popular Ruby on Rails web development framework and the Instiki wiki. He is also a partner at the web-based software development firm Basecamp (formerly 37signals).

Hansson co-wrote Agile Web Development with Rails with Dave Thomas in 2005 as part of The Facets of Ruby Series. He also co-wrote Getting Real, Rework, and Remote with Jason Fried.