Junko Nishimuro (西室淳子, Nishimuro Junko, born December 21, 1980 as Junko Sonobe) is a Japanese curler from Karuizawa, Nagano. She is the second on the SC Karuizawa Club curling team, which is skipped by . At the international level, she represented Japan at the 2005 Pacific Curling Championships and the 2006 World Women's Curling Championship as a result of winning the 2005 Japan Curling Championships.