António Duarte Arnaut, GOL (28 January 1936 – 21 May 2018) was a Portuguese poet, fiction writer, essayist, lawyer, and politician. He was Minister of Social Affairs in the second Constitutional Portuguese Government, led by Mário Soares. He is considered the "father" of the Portuguese national health service (SNS - Serviço Nacional de Saúde, em Português), having created the first basic health law in Portugal and contributed to universal access to medical care for all Portuguese.