Natthanan Junkrajang (; ; born April 13, 1986 in Sing Buri, Thailand) is a Thai swimmer. At the 2008 Summer Olympics, she competed in the women's 100 and 200 m freestyle events. She competed at the 2012 Summer Olympics in the Women's 200 and 400 metre freestyle events, finishing 30th in the 200 m heats and 29th in the 400 m heats, failing to qualify for the final.