A couple of David Mamet one-acts and the latest play by Sam Shepard are among the offerings on tap for the 2009-10 season at Off Broadway’s Atlantic Theater Company.

The org’s mainstage offerings kick off with “Two Unrelated Plays By David Mamet,” a double bill of shorts “Keep Your Pantheon” and “School.”

“Pantheon,” a comic tale about a troupe of actors in ancient Rome, preemed last year at Center Theater Group in L.A., where it was paired with the scribe’s 1971 work “The Duck Variations.”

At the Atlantic it plays with “School,” a world preem billed as a comedy about recycling and communication. Atlantic a.d. Neil Pepe (“Speed-the-Plow”) directs “Two Unrelated Plays,” beginning previews Sept. 9 ahead of a Sept. 30 opening.

Mamet, one of the co-founders of the Atlantic, will be well represented in Gotham this season, with a new play, “Race,” confirmed for a fall opening on Broadway and a revival of “Oleanna” also circling the Main Stem.

Atlantic will import the production of Shepard’s “Ages of the Moon” from Ireland’s Abbey Theater, playing Gotham in a run that begins previews Jan. 9 ahead of a Jan. 27 opening. Jimmy Fay, who helmed the show’s Dublin preem earlier this year, returns to direct.

Play revolves around two old friends for whom shooting the breeze turns dangerous. No casting for the New York incarnation has been announced; Stephen Rea appeared in the two-hander in Dublin.

Atlantic also announced the season’s first production in its smaller space, Atlantic Stage 2. Bekah Brunstetter’s “Oohrah!” follows two couples who live near a military base in a North Carolina town. Evan Cabnet will direct the production, starting previews Sept. 1 and opening Sept. 9.

One more play remains to be announced for the mainstage, along with another for Stage 2.