Ursula Ratasepp-Oja (born June 17, 1982) is an Estonian stage, film and television actress.

Ursula Ratasepp was born in Tallinn in 1982. She is the older sister of actress Katariina Ratasepp (born 1986). She studied drama at the Vanalinnastuudio until 2001, then studied psychology at the University of Tartu until 2002. She then enrolled at the EMA Higher Drama School (now, the Estonian Academy of Music and Theatre) in Tallinn, graduating in 2006. Among her graduating classmates were Inga Salurand, Risto Kübar, Mari-Liis Lill, Laura Peterson, Lauri Lagle, Britta Vahur, and Sergo Vares. In 2014, she received her bachelor's degree in psychology from the University of Tartu.