The soldier, serving with the 3 RIFLES Battle Group, died from injuries sustained in an explosion that happened near Sangin in central Helmand province this morning.
Spokesman for Task Force Helmand, Lieutenant Colonel David Wakefield, said:
"It is my sad duty to inform you that earlier today, the morning of Remembrance Sunday, a soldier from 3 RIFLES Battle Group was killed as a result of an explosion near Sangin in Helmand province.
"One of our fellow soldiers, one of us, who we remembered this morning and who will not be forgotten."
Next of kin have been informed and have asked for a period of grace before further details are released.