Milena Baldassarri (born 16 October 2001 in Ravenna, Italy) is an Italian former individual rhythmic gymnast.

[5] Baldassarri chose to pursue rhythmic gymnastics because she enjoyed the performance aspect, and she has chosen themes of social issues such as suicide, body shaming, and violence against women for some of her exercises.

[6] In 2014 she moved to Fabriano and started being trained by the Olympian Julieta Cantaluppi and her mother, Bulgarian rhythmic gymnast Kristina Guiourova.

[5] In 2015 she was selected to be part of the Italian national junior group that competed at the 2015 Rhythmic Gymnastics European Championships in Minsk, Belarus.

[8] On 19–21 May, Baldassarri, along with her teammates Alexandra Agiurgiuculese and Alessia Russo, represented the individual seniors for Italy at the 2017 European Championships, where she qualified for the ribbon final.

On 4–6 May she competed at the 2018 Guadalajara World Challenge Cup and had a new highest all-around placement when she finished fourth in the all-around behind Russia's Arina Averina.Baldassarri had an overall successful event, qualifying for all four apparatus finals and winning her first World Cup medals.

Baldassarri once again represented Italy with Alexandra Agiurgiuculese at the 2018 Rhythmic Gymnastics World Championships in Sofia.

[11] Baldassarri said the medal came as a surprise and that she regarded it as "the reward for all the hard work, all the sacrifices we made during the months before".

[5] Baldassarri competed at the 2019 World Challenge Cup Minsk, where she won the bronze medal in the ribbon final.

[12] Next, she performed at the 2019 World Challenge Cup Portimao where she won the silver medal in the all-around competition.

At the 2019 World Championships in Baku, Azerbaijan, Baldassarri represented Italy together with Alexandra Agiurgiuculese, Alessia Russo and Sofia Maffeis.

She won a silver medal in the team competition together with Sofia Raffaeli, Alexandra Agiurgiuculese, and the Italian group.

In 2022, Baldassarri competed at the 2022 Sofia World Cup, where she won a bronze medal in the ball final.

On 3–5 June Baldassarri competed at the 2022 World Cup Pesaro and won the silver medal in the all-around competition.

In August, she performed at the 2022 World Challenge Cup Cluj-Napoca and won a bronze medal in the ball final.

[15] On July 14–16, Baldassarri competed at the 2023 World Challenge Cup Cluj-Napoca and won the silver medal in the ball final.

In the qualification round, both she and fellow Italian Sofia Raffaeli placed high enough to each win a berth at the 2024 Summer Olympics for Italy.

From May 23–26, Baldassarri competed at the 2024 European Championships in Budapest, Hungary, where she was selected to represent Italy with three apparatuses in the qualifying round: ball, clubs and ribbon.