Fie Udby Erichsen (born 23 April 1985) is a Danish rower. She set the indoor rowing world record for female rowers in the under 12 years old category in 1998 with a time of 7:30.3. She won the silver medal in the single sculls at the 2012 Summer Olympics.
Erichsen competed for Denmark at the 2016 Summer Olympics, finish 9th in the women's single sculls event. She also competed for Denmark at the 2020 Summer Olympics, finish 8th in the women's coxless pair event.