The Dog Soldiers director will helm a single instalment of the fantasy drama's second season, according to Deadline.
Marshall's work on Game of Thrones will mark his television debut. His past credits include such films as 2005's The Descent, 2008's Doomsday and last year's Centurion.
Other directors confirmed for the new season include The Pacific's David Nutter, Rubicon's Alik Sakharov and Boardwalk Empire's David Petrarca.
Palookaville's Alan Taylor, who directed the ninth and tenth instalments of the first season, will also return.
Natalie Dormer, Carice van Houten, Stephen Dillane, Liam Cunningham, Hannah Murray, Robert Pugh, Michael McElhatton and Patrick Malahide are among the actors to have signed up for roles on Game of Thrones.
The series will return to HBO in early 2012.
> Game of Thrones execs 'not worried about upsetting fans'
Watch the latest trailer for Game of Thrones below: