Ryosuke Irie (入江 陵介 Irie Ryōsuke?, born 24 January 1990) is a Japanese competitive swimmer who competes in backstroke events. He is a Kinki University student in Osaka.
He won a silver medal in the 200 metre backstroke and a bronze in the 100 metre backstroke at the 2012 Summer Olympics. His beautiful backstroke technique has often been compared to Roland Matthes, who was described as the Rolls-Royce of swimming.
He was born in Osaka and started his actual swimming career in his junior high school years. When he was in the second grade, future Olympic backstroke medalist Ryosuke Irie hated swimming. He loathed it so much that his mother had to carry a crying Irie to his coach at poolside.
When he first joined, Irie was one of the slowest swimmers in the elite Itoman Toshin swimming school in Suminoe Ward, Osaka. He joined the school because his older brother, Shinpei Irie, who had won numerous national-level competitions, was in the program. He reluctantly continued swimming only because his mother, Kumiko, promised she would ask the coach if he could quit a year after he joined the school.
Irie initially trained in freestyle, but began swimming the backstroke alone for long periods before and after practice. Backstroke was suitable for Irie because it did not require as much power as freestyle, and soon, Irie began winning national-level competitions and breaking junior high school records.
A year after Irie began training at the elite school, his mother had forgotten her promise to ask the coach if her son could quit.
In 2005 he won the national high school championships in 200 meter backstroke when he was a first year grade student. He made new high school student record in Japanese national championships in April 2006. He narrowly missed the entry for FINA World Aquatics Championships of that year. He won a gold medal with the time of 1:58.85 in 200 m backstroke at the 2006 Asian Games in Doha, Qatar.