Chigaya Mase (間瀬ちがや, Mase Chigaya, born December 5, 1967) is a Japanese ski mountaineer and ultramarathon runner. She lives in Tokyo.
2007:2nd, Asian Championship, Tsugaike Kōgen Ski Resort, Nagano, Japan2009:1st, Asian Championship, relay (mixed teams of 1 woman & 3 men), Beidahu, Jilin, China2nd, Asian Championship, individual2nd, Asian Championship, vertical race2010:10th, World Championship, relay, together with Itō Mayumi and Horibe Michiko1st, Asia Cup1st, Gangwon Provincial Governor's Cup, Yongpyong Ski Resort/Balwangsan1st, Tsugaike (Japan championship & Asia Cup 2nd race), individual, Nagano Prefecture2011:10th, World Championship, relay, together with Catrin Thomas and Horibe Michiko 