Orci had been campaigning to replace J.J. Abrams as director for some time. Since Abrams is busy with directing Star Wars, he will only be producing the film.
This comes after Orci parted company with longtime partner Alex Kurtzman (though they continue to work together on TV projects).
Having previously written both of the new Star Trek films, Orci is joined by screenwriters Patrick McKay and J.D. Payne, on the script for Star Trek 3.
Plot details are unknown but the cast, which includes Chris Pine and Zachary Quinto, are expected to return. There’s no release date for the film yet, but the franchise will be celebrating its 50th anniversary in 2016.