Rio Natsuki (夏樹 リオ) is a Japanese voice actress.
| Series | Skip Beat! | Shouko Aki | 2008-10-05 |
| Series | Shugo Chara! | Yukari Sanjō (voice) | 2007-10-06 |
| Series | Tactical Roar | Clio Aquanaut | 2006-01-07 |
| Series | Tokko | 2006-04-16 | |
| Series | To Heart 2 | (voice) | 2005-10-04 |
| Series | The Snow Queen | Kay (voice) | 2005-05-22 |
| Movie | Mobile Suit Zeta Gundam - A New Translation II: Lovers | Stephanie Luio (voice) | 2005-10-29 |
| Series | The Melody of Oblivion | Unknown | 2004-04-06 |
| Series | Diamond Daydreams | Unknown | 2004-01-13 |
| Series | Ninja Nonsense | Kaede's Mom (voice) | 2004-07-08 |
| Series | Lunar Legend Tsukihime | Unknown | 2003-10-09 |
| Series | Full Metal Panic! | (voice) | 2002-01-08 |
| Series | GetBackers | Hevn (voice) | 2002-10-05 |
| Movie | Digimon Adventure 02: Revenge of Diaboromon | Miyako Inoue (voice) | 2001-03-03 |
| Series | Malice@Doll | Doris@Doll (voice) | 2001-04-27 |
| Movie | Malice@Doll | Doris@Doll (voice) | 2001-04-27 |
| Series | Kokoro Library | Kaeda Hoshino (voice) | 2001-10-12 |
| Movie | The Truth of Grimm Brothers' Fairy Tales | 2000-06-21 | |
| Movie | Hurricane Touchdown | Miyako Inoue (voice) | 2000-07-08 |
| Series | Ghost Stories | Unknown | 2000-10-22 |
| Series | Digimon: Digital Monsters | Miyako Inoue (voice) | 1999-03-07 |
| Series | Turn A Gundam | Merrybell Gadget (voice) | 1999-04-09 |
| Series | DT Eightron | Rei | 1998-04-19 |
| Series | Bubblegum Crisis Tokyo 2040 | Linna Yamazaki | 1998-10-08 |
| Series | Battle Athletes | Akari Kanzaki | 1997-05-25 |
| Series | CLAMP School Detectives | Unknown | 1997-05-03 |
| Movie | Princess Minerva | Orlin Carrie (voice) | 1995-05-01 |
| Series | El-Hazard: The Magnificent World | Nanami Jinnai | 1995-05-26 |
| Series | El-Hazard: The Wanderers | 1995-10-06 | |
| Series | Macross 7 | Miho (voice) | 1994-10-16 |
| Movie | Hurricane Live! 2032 | 1988-04-24 |