Anna de Castro Belisário Soares de Sousa Peçanha (Campos dos Goytacazes, 21 March 1876 — Rio de Janeiro, 9 April 1960) was the wife of the 7th President of Brazil, Nilo Peçanha and the First Lady of Brazil from 1909 to 1910. She was also the from 1906 until the death of Afonso Pena in 1909, and the first lady of the state of Rio de Janeiro for two periods, between 1903 and 1906 and between 1914 and 1917.