30 January - Ministerial Notice No. 501 is issued, establishing the Naval Division for War Operations (Divisão Naval em Operações de Guerra - DNOG).[1]
June - The Brazilian battleship São Paulo is sent to the USA for a full refit.[3]
18 August - The Brazilian Medical Mission, led by Dr. Nabuco Gouveia and directed by General Aché, is established with 86 doctors.
24 September - The Brazilian Medical Mission lands at Marseilles, France, and supports the local population during a flu outbreak, ensuring the continuity of logistical support to the troops at the front.
15 November - President-elect Rodrigues Alves, suffering from influenza, is unable to take office on the scheduled date, and is replaced by Vice President Delfim Moreira.
^Francisco Verras; "D.N.O.G.: contribuicao da Marinha Brasileira na Grande Guerra" ("DNOG; the role of Brazilian Navy in the Great War") (in Portuguese) "A Noite" Ed. 1920