2021 Tro-Bro Léon

The 2021 Tro-Bro Léon was the 37th edition of Tro-Bro Léon, a one-day road cycling race in the northwestern French region of Brittany, that took place on 16 May 2021. The 1.Pro-category race was initially scheduled to be a part of the inaugural edition of the UCI ProSeries, but after the 2020 edition was cancelled due to the COVID-19 pandemic, it made its UCI ProSeries debut in 2021, while also still being a part of the 2021 UCI Europe Tour. It was also the fourth event of the 2021 French Road Cycling Cup.

This year's edition was the first since its move to the new mid-May time slot from its usual late April time slot. The race started and finished in Lannilis, and covered 207 km of the rolling and windy roads of Brittany. Interspersed along the route were 26 ribinoù sections totalling 30.6 km.

Teams
Six of the nineteen UCI WorldTeams, eleven UCI ProTeams, and four UCI Continental teams made up the twenty-one teams that participated in the race. Each team was allowed to field up to seven riders, but many teams chose to enter less than the maximum: and  each entered five riders, while, , , , and  each entered six. With two late scratches, 136 riders started the race, of which 86 finished.

UCI WorldTeams



UCI ProTeams



UCI Continental Teams