Theresia Widiastuti born 1954, is a former Indonesian badminton player in the 70s.
Theresia Widiastuti is a specialist in women's doubles and mixed Indonesian players. In the 1975 Uber Cup,  she played an important and decisive role because she managed to win in two women's doubles matches with Imelda Wiguna against Japanese women's doubles and led Indonesia to win the Uber Cup for the first time. In the 1976 Asian championships she also won the women's doubles with Regina Masli. and won two bronze in women's doubles in the 1974 and 1978 Asian games and one mixed doubles silver. 
|1978||Bangkok, Thailand||Ruth Damayanti|| Qiu Yufang
|1976||Hyderabad, India||Regina Masli|| Liang Qiuxia
|15–8, 17–18, 15-6||Gold|
- "Indonesia berjaya rampas Piala Über kalahkan Jepang". Berita Harian. 8 June 1975. p. 10. Retrieved 14 October 2020 – via NewspaperSG.
- "Indonesia-Cina menguasai Badminton Asia". Berita Harian. 9 November 1976. p. 7. Retrieved 14 October 2020 – via NewspaperSG.
- "ASIAN GAMES RESULTS". The Straits Times. 19 December 1978. p. 31. Retrieved 24 October 2020 – via NewspaperSG.