David James Ritchie (October 6, 1950 - September 6, 2009) was a role-playing game designer from Canton, Ohio. He was the co-author of DA modules 1-3 and the only author listed for DA4. The DA module series were a series of four adventures for the Dungeons & Dragons role-playing game, designed to be compatible with the Dungeons & Dragons Expert Set. They were written for character levels 10–14 and published between 1986 to 1987.
The 1983 rules for the second edition Gamma World boxed set were designed by Ritchie along with the original designers James M. Ward and Gary Jaquet.
On September 6, 2009, he passed away at his home in Connecticut. He was 58 years old.