Marsco is a peak in the Re Hills on the Scottish Isle of Skye. It lies on the east of Glen Sligachan, and may be climbed from the right-of-way through the glen from Sligachan to Loch Coruisk. Alternatively, it may also be reached from Coire nam Bruadaran on the western side. Marsco has magnificent views of the main Cuillin ridge as well as out to sea; many walkers reckon it is perhaps the finest of all the Grahams.