The Greece Runestones comprise about 30 runestones containing information related to voyages made by Norsemen to "Greece", which referred to the Byzantine Empire. They were made during the Viking Age and until c. 1100. The stones were engraved in the Old Norse language with Scandinavian runes. All of the stones were found in modern-day Sweden, and the majority reside in Uppland (18 runestones) and Södermanland (7 runestones).
Most of the stones were carved in memory of members of the Varangian Guard who never returned home, but a few stones mention men who returned with wealth. The only group of runestones that refer to expeditions abroad that are comparable in number are those that mention expeditions to England, the England Runestones. The stones vary in size from the small whetstone from Timans, to the boulder in Ed which is 18 m (59 ft) in circumference. Most of them are adorned with various runestone styles that were in use during the 11th century, and especially styles that were part of the Ringerike style (eight or nine stones) and the Urnes style (eight stones).
The runestones have been continuously identified by scholars beginning with Johannes Bureus in the late 16th century, with many stones discovered during a national search for historic monuments in the late 17th century.