Fernando Tamagnini de Abreu e Silva (13 May 1856 in Tomar, Portugal – 24 November 1924 in Lisbon, Portugal) was cavalry officer and general of the Portuguese Army.
As a general, from January, 1917 to August 25, 1918, Tamagnini was the commander of the Portuguese Expeditionary Corps (CEP), a 55,000 men army corps that fought with the Allies in the Western Front, during World War I.