山木梨沙 (Yamaki Risa) is a former Japanese idol under Hello! Project as a member of Country Girls and a former member of College Cosmos. She first joined Hello! Project as a Hello Pro Kenshuusei member in September 2013. On October 31, 2019, Yamaki graduated from College Cosmos. She later retired from entertainment following Country Girls' suspension of activities on December 26, 2019.