Following her return to the UK, "Iroquois" was assigned to escort convoys heading to the Soviet Union over the following months. From 1–11 October, "Iroquois" and the destroyers and transported supplies to Murmansk for the escorts that remained there in the summer. Beginning in November, "Iroquois" provided support to Russian convoys, beginning with convoy JW 54A from Loch Ewe on 18–24 November and convoy RA 54B from Molotvsk on 28 November. In late December, "Iroquois" escorted the convoy JW 55B. It came under air attack on 23 December, but was unscathed. The convoy sailed as a lure for the , which was sunk by British forces on 26 December. On 31 December, the warship was among the escort for RA 55B which departed Kola Inlet on 31 December and reached Loch Ewe on 8 January without loss.