Guadalcanal Diary is a memoir written by war correspondent Richard Tregaskis and originally published by Random House on January 1, 1943. The book recounts the author's time with the United States Marine Corps on Guadalcanal in the early stages of the pivotal months-long battle there starting in 1942. Tregaskis relates combat and conversation in an easily readable vernacular, citing the full name, rank, and hometown of each of the Marines he encountered during the weeks he was on the island.