Ugnė Mažutaitytė (born 14 March 1997) is a Lithuanian swimmer.

She competed in the women's 100 metre backstroke event at the 2017 World Aquatics Championships.

[1][2] In 2019, she represented Lithuania at the 2019 World Aquatics Championships in Gwangju, South Korea.

[3] She competed in the women's 200 metre backstroke event and she did not advance to the semi-finals.

[4] On 3 August 2022 Mažutaitytė announced her retirement from professional sport.