Mark Gordian was a pseudonym used by Harry Turtledove on two occasions. The first was in December 1984 in the story "Hindsight." The main character, Michelle Gordian uses the name to mask her gender when she publishes stories in the science fiction magazines in 1953.
The following year, Turtledove had two short stories appear in the August issue of Analog. The first, "Les Mortes d'Arthur" was published using the Eric Iverson pseudonym and the second, "Notes from the General Secretariat" used the pseudonym Mark Gordian.