Kasumi Nishihara (西原 加純, Nishihara Kasumi, born 1 March 1989) is a Japanese athlete specialising in the long-distance events.^[1] She won two medals at the 2009 Summer Universiade – the gold in the 10,000 metres and the silver in the 5000 metres.

Outdoor

• 3000 metres – 9:15.9 (Kyoto 2006)
• 5000 metres – 15:23.80 (Yamaguchi 2011)
• 10,000 metres – 31:53.69 (Kobe 2014)
• 10 kilometres – 32:26 (Okayama 2010)
• Half marathon – 1:11:58 (Kyoto 2009)