Nguyen Thi Hoai Thu

Nguyễn Thị Hoài Thu (January 7, 1985) is a Vietnamese taekwondo practitioner. She is a three-time medalist (two golds and one bronze) for the women's featherweight division at the Southeast Asian Games. She also captured two silver medals in the 53 and 59 kg classes at the 2006 Asian Games in Doha, Qatar, and at the 2010 Asian Games in Guangzhou, China, losing out to South Korea's Lee Sung-Hye and Thailand's Sarita Phongsri, respectively.

Nguyen qualified for the women's 57 kg class at the 2008 Summer Olympics in Beijing. After placing second from the Asian Qualification Tournament in Ho Chi Minh City, Vietnam. Unfortunately, she lost the first preliminary round match to Senegal's Bineta Diedhiou, with a sudden death score of 0–1.