Hayato Sumino (born 14 July 1995) is a Japanese pianist and composer known for his performances of music by Frédéric Chopin.

Born in Tokyo, he started playing the piano at age 3. He studied science and engineering at the University of Tokyo's Graduate School of Information Science and Technology, graduating in March 2020 with a master's degree and the President's Award. He also studied music information processing technology and artificial intelligence for six months at the French Institute for Research and Coordination in Acoustics/Music.

In August 2018, he won the Grand Prix at the 42nd PTNA Piano Competition, a Japanese piano competition. In July 2019 he won third prize at the Lyon International Piano Competition.

In 2021, Sumino participated in the XVIII International Chopin Piano Competition in Warsaw, in which he advanced to the third round (the semifinal). His live performance in the second round attracted 45,000 online viewers, setting a record for the competition. Before the competition, he had studied intensively online (due to the COVID-19 pandemic) with Jean-Marc Luisada.

Sumino is also a YouTuber by the name of "Cateen", with over one million subscribers as of 2022.

He is a Steinway artist. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.