Guillermo León Teillier del Valle (29 October 1943 – 29 August 2023) was a Chilean politician, educator, and writer and president of the Communist Party of Chile (PCC).

[1] In the middle of that year, while participating in a political meeting in Santiago, he was arrested by agents of the Air Force Intelligence Service (Sifa).

[4][5][6] President Gabriel Boric expressed his condolences and decreed national mourning for Teillier's death, "as a tribute to his dedication to Chile throughout his life, and his tireless effort to build a more just society".

[1] Deputies from the right-wing opposition parties National Renewal and the Republican Party criticized the national mourning, citing Teillier's role in the 1986 arms smuggling at Carrizal Bajo and for acting as the link between the PCC and the Manuel Rodríguez Patriotic Front during the military dicatorship.

[2] Venezuelan president Nicolás Maduro also expressed his condolences, calling Teillier a great friend of his and "of Hugo Chávez and of the Bolivarian Revolution".