Duncan Alasdair Lunan, born October 1945, is a Scottish author with emphasis on astronomy, spaceflight and science fiction. 

In 1973, in an article in Spaceflight, the magazine of the British Interplanetary Society (BIS), he said he had identified and deciphered a hidden radio message sent by an alien space probe that had been caught but overlooked in the late 1920s by researchers who were studying the long delayed echo effect. Some considered the probe might have been sent by an earlier unknown Earth civilization, which was destroyed in the biblical cataclysm that destroyed the fables Atlantis.

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