O merciful God, take pity on those souls who have no particular friends and intercessors to recommend them to Thee, who, either through the negligence of those who are alive, or through length of time are forgotten by their friends and by all. Spare th> >
em, O Lord, and remember Thine own mercy, when others forget to appeal to it. Let not the souls which Thou hast created be parted from thee, their Creator.
May the souls of all the faithful departed, through the mercy of God, rest in peace.
Source : http://catholicgo.org/a-prayer-for-the-forgotten-dead/