The soldier died from wounds he sustained in an explosion while on a foot patrol near Sangin in Helmand province on the evening of Saturday 15 August 2009.
Spokesman for Task Force Helmand, Lieutenant Colonel Nick Richardson, said:
"This fine British soldier made the ultimate sacrifice and his passing is mourned by the Task Force. Our thoughts and prayers are with his family, friends and comrades at this very sad time."
Next of kin have been informed and have asked for a period of grace before any further details are released.