Mariko Mori (森 万里子 Mori Mariko, born June 17, 1981) is a Japanese volleyball player who plays for Toray Arrows. She served as sub captain of the team between 2008 and 2010. Her maiden name was Mariko Nishiwaki.

• Osaka Shitennouji high school
• Toyobo Orkis (2000–2002)
• Toray Arrows (2002–2012)

• 2006–07 V.Premier League – Spike awards
• 2008–09 V.Premier League – Spike awards, Best6

• 2004 Kurowashiki All Japan Volleyball Championship – Champion, with Toray Arrows
• 2007 Domestic Sports Festival (Volleyball) – Champion, with Toray Arrows
• 2007–2008 Empress's Cup – Champion, with Toray Arrows
• 2007–2008 V.Premier League – Champion, with Toray Arrows
• 2008 Domestic Sports Festival – Runner-Up, with Toray Arrows
• 2008–2009 V.Premier League – Champion, with Toray Arrows
• 2009 Kurowashiki All Japan Volleyball Championship – Champion, with Toray Arrows
• 2009–2010 V.Premier League – Champion, with Toray Arrows
• 2010 Kurowashiki All Japan Volleyball Championship – Champion, with Toray Arrows
• 2010–11 V.Premier League – Runner-Up, with Toray Arrows

• 2008 World Grand Prix 2008

• FIVB biography
• Toray Arrows Women's Volleyball Team