HSC Speedrunner III is a fast ferry operated by Aegean Speed Lines between Piraeus, Siros, Tinos and Mykonos. She was built in 1999 at Fincantieri, Riva Trigoso, Italy, for Sea Containers Ltd as HSC SuperSeaCat Three. Under that name she sailed on Sea Container's services around the British Isles, as well as with their subsidiaries Silja Line and SuperSeaCat on the Baltic Sea.