Keith Martin may refer to:

• Keith Martin (politician) (born 1960), Canadian executive director of the Consortium of Universities for Global Health, former politician
• Keith Martin (ophthalmologist) (born 20th-century), medical researcher specialising in the treatment of glaucoma
• Keith Martin (broadcaster) (1934–2024), British broadcaster and pirate radio DJ
• Keith Martin (musician) (1966–2022), American R&B singer-songwriter and multi-instrumentalist
• Keith Martin (artist) (1911-1983), American abstract and surrealist artist
• Keith Martin (Time Crisis), a character in Time Crisis II
• Carl Sargent or Keith Martin (born 1952), British parapsychologist and author of several roleplaying game-based products and novels
• Keith Martin, founder and editor of Sports Car Market