Weeks Stack () is a sea stack lying off the north tip of Nelson Island in the northern approach to Fildes Strait, in the South Shetland Islands. Named by the United Kingdom Antarctic Place-Names Committee (UK-APC) in 1961 for Captain Weeks, Master of the British sealing vessel Horatio from London, who visited the South Shetland Islands in 1820-21.
This article incorporates public domain material from the United States Geological Survey document "Weeks Stack" (content from the Geographic Names Information System).