Helle Trevino (née Nielsen) is a United States–based Danish professional female bodybuilder and the title winner of the 2017 and the 2019 Rising Phoenix World Championships.

She was a gymnast from the age of three and competed in various other sports, including ballroom dancing, swimming, track and field, shot put, martial arts, horse-riding, boxing, biking, ballet and yoga.

Inspired by Kim Chizevsky-Nicholls, she started her career in bodybuilding at that gym and trained there for five years.

[5][9] After spending a few years building up her personal training business, Trevino in 2011 won the FIBO pro show and placed 11th at the 2011 Ms. Olympia.

At the 2015 Rising Phoenix World Championships, due to the retirement of Iris Kyle, along with Alina Popa not competing due to injuries, Helle was able to surpass much more seasoned professional bodybuilders, such as Yaxeni Oriquen-Garcia and Debi Laszewski, and placed 2nd.

Rising Phoenix title, making her the top female bodybuilder in the world at the time.

At the 2019 Rising Phoenix World Championships, with Alina retired and not defending her title, she won her second Ms.

At the 2021 Rising Phoenix World Championships, Helle would again place 2nd to Andrea Shaw.

She would take the year of 2023 off and plans on competing again in 2024 and announced her coach for 2024 would be David DeMesquita, amateur men's physique contestant.