Guilherme Marcelo Mapelli (born 23 August 1994 in Americana) is a Brazilian slalom canoeist.

[1][2][3] Mapelli was born in Americana, São Paulo, but has lived in Três Coroas, Rio Grande do Sul, since he was very young.

After that, he never stopped and officially started competing again in 2007, in São Paulo, where he won his first medal in the city of Cerquilho.

From then on, Mapelli won an international athlete fund and with this he began to buy his equipment, investing more in his career.

[9] In 2023, Guilherme Mapelli was also working as a coach, heading a base school in Três Coroas.