The Stena Adventurer is a large roro ferry that operates between Holyhead and Dublin. She is owned by Stena Line. She was built in 2002 and entered service in 2003. She has a sister ship, the Stena Scandinavica which operates between Harwich and Hoek van Holland. She travels alongside the high speed catamaran, the Stena Explorer. She shares the Holyhead terminal with the Ulysses of Irish Ferries, which travels with the Stena Adventurer to Dublin. The vessel is one of the most stable ships in the word, being one of the pioneers of the 'box-shaped hull' design. The Stena Adventurer's current port of registry is in London, England.
- The Stena Adventurer was featured on the documentary Built from Disaster, which discussed her stability and her bow doors.