Bryan Cogman (born 25 July 1979) is an American scriptwriter. He previously worked on the short-lived series My Own Worst Enemy as a writing assistant and story editor.
Cogman worked on the Game of Thrones pilot as a writing assistant and on the full series as a script-editor and writer. He has also written three episodes of the series, as well as many of the "history" special features on the Season 1 DVD/Blu-ray set. He also serves as the unofficial "keeper of the mythos" for the show. He also wrote the series bible outlining character and background information for other writers, actors and crew to consult. He is the author of Inside HBO's Game of Thrones, the official companion guide to the series.
Season 1 Blu-ray/DVD special features, notably history and character descriptions. Cogman wrote the 60 minutes' worth of featurettes known as the "Complete Guide to Westeros", in which cast members, in-character, narrate the history of Westeros. It functionally constitutes an entire "bonus episode" of sorts.