Ark is a science fiction fanzine by Ron Clarke and Susan Smith-Clarke.
Ron Clarke had been publishing The Mentor since 1965. In 1973, The Mentor issue 23 was a split zine with Susan Smith-Clarke's fanzine Girl’s Own Fanzine. Ark was the couple's attempt to merge the two zines and publish together.
The first issue of Ark, published in December 1974 in New South Wales, Australia, featured cover art work by Virgil Finlay. It was 46 pages.
The second issue was also released in 1974, and was 40 pages. Darrol Pardoe, in his Checkpoint #50 review from June 28, 1974, said of this issue, "Vol Molesworth has a good bit on Australian fan history, vintage 1941. There's not enough timebinding in fandom these days."
Darroll Pardoe was referring to the article "Outline History of Australian Fandom" by Vol Molesworth.
Ron Clarke also published the horror zine Cold Cuts.
Susan Smith-Clarke's later fanzines include the media science fiction fanzines Beyond Antares (1977-1986), the official fanzine of the Star Trek club Astrex, and Chronicles (1984-), a Blake's 7 fanzine. In 1982 she began editing Medtrek for Medtrek SF Media Convention.