Cajus Schmiedtlein was a German Renaissance composer and organist and is best known for his time as the organist at St. Mary's Church, Gdańsk. His name appears in different spelling variants in the Low German dialect (Caj Schmedeke, Key Schmedeke, Schmedecke, Smedeke, Schmedcke, Schmiedeke) and in Standard High German (Cajus Schmiedlein, Caius Schmitlein, Schmidtlein, Schmittlein).
