Events in the year 1917 in Portugal.

• President: Bernardino Machado
• Prime Minister: Four different.

• 13 October – Miracle of the Sun near Fátima
• The Portuguese Naval Aviation established

• Académico de Viseu FC founded

• 31 January – Manuel da Luz Afonso, football manager (d. 2000)
• 18 March – Joaquim Teixeira, footballer (d. unknown)
• 5 June – José Baptista Pinheiro de Azevedo, politician (d. 1983)
• 27 June – Artur Quaresma, footballer (d. 2011)
• 1 August – Manuel Soares Marques, footballer (d. 1987).^[1]
• 29 October – Virgílio Teixeira, actor (d. 2010)
• 22 December – Eduardo Lopes, cyclist (d.1997)

• 5 March – Manuel de Arriaga, lawyer and politician (born 1840)
• 18 March – António José de Ávila, 2nd Marquis of Ávila and Bolama, military officer, politician, nobility (b. 1842)
• 5 June – António Teixeira de Sousa, physician and politician (b. 1857)
• 6 November – António Júlio da Costa Pereira de Eça, Army general (b. 1852)

• Abel Botelho, military officer and diplomat (b. 1855)
• Hermenegildo Capelo, Navy officer (b. 1841)
• Guilherme de Vasconcelos Abreu, writer, cartographer and orientalist (b. 1842)