Stephen Euin Cobb (born February 3, 1955) is a US science fiction author specializing in hard science fiction.

His first published novel was Plague at Redhook (1999) which dealt with nanotechnology of a highly advanced form, as well as a nanoplague and human immortality. Perhaps his best-known work is Bones Burnt Black (2004), a murder-mystery set aboard a large critically-sabotaged passenger spacecraft.

All his novels occur within the same fictional universe which has been nicknamed "Naked Space" in honor of an obscure fictional cosmological theory put forth by one of the fictional aliens within one of his novels.

He has also invented a number of games, the most famous being Death Stacks for which there is an annual tournament.

Stephen Euin Cobb was born in Orangeburg, South Carolina; spent his childhood in Forest Park, Illinois (a suburb of Chicago); and now lives in South Carolina.