Keith Alexander is a British actor and voice actor.

Alexander's television credits include Softly, Softly (1966), The New Avengers (1976), Minder (1979) and The Day of the Triffids (1981). On the big screen, he has had roles in Submarine X-1 (1968), Superman (1978), Hanover Street (1979) and All About a Prima Ballerina (1980).

He has also featured in some of the productions of Gerry Anderson. In addition to voicing the character of John Tracy and serving as narrator for the 1968 film Thunderbird 6, Alexander voiced Sam Loover and numerous supporting characters in the TV series Joe 90 (1968-69). His other Anderson appearances are the 1969 film Doppelgänger and the TV series The Secret Service (1969) and UFO (1970) as Lt. Keith Ford.