Lawrence G. "Larry" DiTillio is an American film and TV series writer.
After first few attempts at writing for television and movies in the 1970s including a stint on Filmation's Fat Albert and the Cosby Kids, Larry DiTillio became a staff writer for the original He-Man and the Masters of the Universe series. He wrote the most episodes throughout both seasons, totalling 16 episodes as well as directing one.
Flying Buffalo hired DiTillio in 1983 when he was out of work due to a strike. He wrote The Isle of Darksmoke (1984), Flying Buffalo's last multiplayer Tunnels & Trolls adventure. With Lynn Willis, he wrote The Masks of Nyarlathotep (1984), a world-spanning campaign for Call of Cthulhu, which is considered one of the best roleplaying adventures of all time. He is the author of several tabletop roleplaying supplements, including the Origins Award-winning Masks of Nyarlathotep.
DiTillio is known for his role as executive story editor of the science-fiction series Babylon 5, and for writing or co-writing most of the episodes in the animated series Beast Wars. He was a writer for the 2002 He-Man and the Masters of the Universe series.