Marcos Guilherme de Almeida Santos Matos (born 5 August 1995), known as Marcos Guilherme, is a Brazilian professional footballer who plays as a winger for Japanese club V-Varen Nagasaki.

Guilherme Antonio Arana Lopes (born 14 April 1997), known as Guilherme Arana, is a Brazilian professional footballer who plays as a left-back for Atlético Mineiro and the Brazil national team.

Guilherme de Abreu Sampaio Samaia (born 2 October 1996 in São Paulo) is a Brazilian former racing driver.

Guilherme Bissoli Campos (born 9 January 1998) is a Brazilian professional footballer who plays as a forward for Thai League 1 club Buriram United.

Guilherme Mendes Godoy (born 1988 in Rio Claro, São Paulo, Brazil) is a four-time Brazilian Jiu-Jitsu world champion at the black belt level.

Guilherme dos Santos Torres (born 5 April 1991), commonly known as Guilherme, is a Brazilian professional footballer who plays as a defensive midfielder of Qatar Stars League football club Al Sadd.

Guilherme Alvim Marinato (born 12 December 1985) or simply Guilherme is а professional footballer who plays as a goalkeeper.

Guilherme de Paula Lucrécio (born 9 November 1986) is a profesional footballer who last played as a forward who plays for Liga M3 club Melaka.

Guilherme Peirão Leal (born in Santos on 22 February 1950) is a Brazilian businessman, social and environmental entrepreneur, and philanthropist.

(born September 24, 1985) a retired Brazilian footballer who played as an attacking midfielder, commonly known as Guilherme in Brazil and Gui Finkler in Australia and New Zealand.

Guilherme de Aguiar Camacho (born 2 March 1990), sometimes known as just Camacho, is a Brazilian footballer who plays as a midfielder for Guarani.