| Alzira Costa | |
| Birth Name: | Alzira Coelho de Campos de Barros de Abreu |
| Birth Date: | 20 April 1875 |
| Birth Place: | Oliveira do Hospital, Coimbra, Portugal |
| Death Place: | Nossa Senhora de Fátima, Lisbon, Portugal |
| Signature: | Assinatura Alzira Costa.svg |
Alzira Coelho de Campos de Barros de Abreu Costa (20 April 1875 – 21 February 1970) was the wife of Portuguese politician Afonso Costa.
Alzira de Barros de Abreu was born in 1875, in Oliveira do Hospital, in Coimbra, the daughter of Albano Mendes de Abreu, a medical doctor, and his wife, Emília de Barros Coelho de Campos.[1] She was the sister of the writer and politician José de Barros Mendes de Abreu, who was born on 20 July 1878.[2]
She married Afonso Costa in the New Cathedral of Coimbra, on 15 September 1892.[1] In 1916, she was one of the founders of the Portuguese Women's Crusade.[3]
She died at the age of 94, in Nossa Senhora de Fátima, Lisbon.[1]