Jim Baen's Universe (JBU) was a bimonthly onlinefantasy and science fiction magazine created by Jim Baen (founder and long-time publisher of Baen Books). It is recognized by the SFWA as a Qualifying Short Fiction Venue.JBU began soliciting materials in January 2006 and launched in June 2006. The magazine contained around 120,000 to 150,000 words per issue. It closed in 2010.
Jim Baen died of a stroke on June 11, 2006 and did not see the magazine's full success. The first and only editor-in-chief was Eric Flint, an author and anthologist. The executive editor was Mike Resnick, a science fiction author, editor and anthologist.
Part of the magazine's philosophy was to nurture new authors, slots were reserved in each issue for new writers. Amateur writers were encouraged to submit their work via an online forum, referred to as "e-slush." Stories submitted to e-slush were reviewed by peers and associate editors. The theory was that this process may turn stories that were not quite publishable into publishable ones.
Editor Eric Flint announced in August 2009 that the magazine would close after its April 2010 issue due to insufficient subscriber income.