SS "Royal Iris" was a Mersey Ferryboat built in 1906 for Wallasey Corporation. She was built as "Iris" for service on the River Mersey. In 1918 she was requisitioned by the Royal Navy for action during the Zeebrugge Raid. She was renamed "Royal Iris" in recognition of her part in this action and returned to civilian duties. She was sold in 1931 and renamed "Blarney" in 1946. She was scrapped in December 1961.