Knowe of Yarso chambered cairn is a Neolithic burial monument located on the island of Rousay in Orkney, Scotland. The site was excavated in the 1930s, and uncovered human and animal bones as well as pottery sherds, flint and bone tools, and arrowheads. The tomb, dating to the period between 3500 and 2500 BC, is a stalled chambered cairn, similar to Midhowe and Blackhammer. Historic Environment Scotland established the site as a scheduled monument in 1994.