Terrance Dicks (born 14 April 1935) is an English author and former television screenwriter, script editor and producer. In television, Dicks had a long association with the BBC science-fiction series Doctor Who, working as a writer and also serving as the programme's script editor from 1968 to 1974. The Doctor Who News Page described him as "arguably the most prolific contributor to Doctor

In 1968, Dicks was hired as assistant script editor on the popular BBC science-fiction TV series Doctor Who. He was appointed head script editor the following year, and earned his first writing credit for the programme when he and Hulke co-wrote the 10-part serial The War Games, which concluded the series' sixth season and the Second Doctor's (Patrick Troughton) tenure. Dicks had, however, been the uncredited co-writer of the earlier serial The Seeds of Death, having extensively re-written Brian Hayles' original scripts.  Dicks went on to form a highly productive working relationship with incoming Doctor Who producer Barry Letts, serving as script editor on all of Letts' five seasons as head of the programme from 1970 to 1974. In 1972, Dicks embarked on a parallel career as an author with the publication of his first book, The Making of Doctor Who (a history of the production of the TV series), which was co-written by Hulke.  After stepping down as script editor, Dicks continued his association with Doctor Who, writing four scripts for his successor, Robert Holmes: these were Robot (1975, Tom Baker's first outing as the Fourth Doctor), The Brain of Morbius (1976, for which Dicks was credited under the pseudonym "Robin Bland" after his displeasure at Holmes' re-writes prompted him to request that it be shown "under some bland pseudonym"), Horror of Fang Rock (1977) and State of Decay (1980).  State of Decay was in fact a re-written version of a story originally titled The Vampire Mutations, which had been due for production during season 15 until the BBC decided that the vampiric theme would clash with the plot of its new adaptation of Bram Stoker's Count Dracula, which was due for transmission at roughly the same time, and replaced it with Horror of Fang Rock. Dicks penned his final Doctor Who script in 1983, when he wrote the programme's 20th anniversary special episode, The Five Doctors.  Dicks' other work for Doctor Who includes two stage plays, Doctor Who and the Daleks in the Seven Keys to Doomsday (1974) and Doctor Who - The Ultimate Adventure (1989), and an audio drama for Big Finish Productions titled Comeback (2002), which was the first to feature former Doctor's companion Sarah Jane Smith in a significant capacity.

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