Riona (리오나) is a Japanese-American artist. She is a member of the Korean pop girl group PoshGirls and the Japanese pop idol group AKB48 as the Tokushima representative of Team 8.
- Stage Name: Riona (리오나/リオナ)
- Birth Name: Riona Crystal Hamamatsu
- Japanese Name: Hamamatsu Riona (濵松里緒菜)
- Nickname: Riona (りおな)
- Birthdate: July 28, 1995
- Birthplace: Los Angeles, California, USA
- Hometown: Tokushima, Japan
- Blood Type: O
- Height: 158cm
- Weight: 38kg
- Education: Sophia University (Faculty of Foreign Studies - Department of English) (Graduated)
- Hobbies: Singing, dancing, watching movies, listening to music
- Specialties: Singing, dancing, having an English conversation
- Bands / Groups:
-  FAKE LOVE (short film - lead role)
-  NeoOz (as Matilda)
-  O-Getsu KAGURA (Young female priest)
AKB48 Song Participation
- AKB48 Team 8 1st Stage "PARTY ga Hajimaru yo"
- AKB48 Team 8 2nd Stage "Aitakatta"
- Originally a member of AKB48 Team 8 as the first representative of Tokushima, she announced her graduation on June 12, 2017 and graduated on July 2, 2017. Her successor was Harumoto Yuki.
- The kanji for her surname "Hamamatsu" is written as 濵松, instead of the more common 浜. However, the latter kanji is used in places such as mobile websites where the proper kanji is not supported.
- Her special skill is conversing in English. She lived in Los Angeles, California until the age of 10.
- Besides speaking Japanese and English, she can also speak Korean and a little bit of Thai.
- She performed at Japan Expo Malaysia 2020.
- She started learning figure skating in Los Angeles since the age of 3, but when she moved to Tokushima, she started dancing instead because there were no rinks.
- She was a member of the Moveness dance crew.