Álvaro Guevara Reimers (Valparaíso, Chile, 13 July 1894 – Aix-en-Provence, France, 16 October 1951) was a painter, based in London and loosely associated with the Bloomsbury set.
Guevara left Chile in 1909 and arrived in London on 1 January 1910. He attended Bradford Technical College, studying the cloth trade, but also spent two years secretly studying at the Bradford College of Art. After failing his technical college exams he went on to the Slade from 1913 to 1916 and had a one-man show at the Omega Workshops.
He married Meraud Guinness (1904-1993), a painter and member of the Guinness family, and settled in France. He died in Aix-en-Provence on 16 October 1951.