Katie Shanahan (born 25 June 2004) is a Scottish professional swimmer.

[1][2] Shanahan competed in the women's 400 metre individual medley event at the 2021 FINA World Swimming Championships (25 m) in Abu Dhabi.

[3] At the 2022 Commonwealth Games, held in Birmingham, England, starting in July, Shanahan won the bronze medal in the 400 metre individual medley with a time of 4:39.37.

[4][5] Three days later, she won the bronze medal in the 200 metre backstroke with a personal best time of 2:09.22.

[8] After finishing second in both the 200 metres backstroke and the 400 metres medley at the 2024 Aquatics GB Swimming Championships, Shanahan recorded times that met the British Consideration criteria for a place at the 2024 Summer Olympics.