Tatiana Ullua (born 23 April 1992) is an Argentine weightlifter. She won the gold medal in the women's 64kg event at the 2023 Pan American Weightlifting Championships held in Bariloche, Argentina. She won the bronze medal in the women's 64kg event at the 2022 South American Games held in Asunción, Paraguay.
Ullua competed in the women's 59kg event at the 2019 Pan American Games held in Lima, Peru. In 2022, she competed in the women's 64kg event at the Pan American Weightlifting Championships held in Bogotá, Colombia.
Ullua competed in the women's 71kg event at the 2023 Pan American Games held in Santiago, Chile.