John Meredyth Lucas (1 May 1919 — 19 October 2002) was a writer, director and producer most active from 1950 to the mid-1980s. Like fellow SMDM writer, D. C. Fontana, he is perhaps best known for his work on Star Trek, where he produced many episodes of the second season, and where he was the only writer to also direct an episode he had written.
Despite his connection with Star Trek, he had healthy bodies of work for Mannix, Alfred Hitchcock Presents, The Fugitive, Ben Casey, and Night Gallery. He also directed the final episode of Planet of the Apes and wrote for Logan's Run and Kojak. He was also heavily involved in a number of shows that didn't run beyond two seasons, like Harry O and Medic.
His work for The Six Million Dollar Man came quite late in his career. H＋2＋O = Death, Dark Side of the Moon and Date With Danger (Part II) were among his final writing credits for episodic television.