Bradley Joseph "Brad" Fitzpatrick, often seen on the Internet under the nickname bradfitz, is an American programmer. He is best known as the creator of LiveJournal and is the author of many popular free software projects. Born in Iowa, Fitzpatrick grew up in Beaverton, Oregon and majored in computer science and minored in German at the University of Washington in Seattle. While there, he developed LiveJournal as an extension of a database-driven method he had been using to update his personal journal.

LiveJournal eventually became a full-time job and then a company, which he called Danga Interactive. In January 2005, Fitzpatrick sold Danga to Six Apart, reportedly for an undisclosed sum of cash and stock. He was named chief architect of Six Apart. He left Six Apart in August 2007, citing a need to move on to different projects, and had not been active in LiveJournal's development for about two years. He now works for Google.