Romualda Baudouin de Courtenay, née Bagnicka (born November 17, 1857, in Aleksandrówka near Kyiv, died February 26, 1935, in Warsaw) was a Polish historian, specialist in Polish-Russian affairs, and author of books, diaries and journalistic articles.

Baudouin de Courtenay was born November 17, 1857, in Warsaw of mother Anna Głuchowska and father Romuald Bagnicki, a doctor.

Her mother left her father to raise their three children alone, including Romualda, a sister Janicki, and a brother Darius.

Publications she wrote for included Pravda (Warsaw), Kraj of St. Petersburg, Kurier Codzienny of Warsaw, Nowa Reforma of Kraków, Czas in Kraków, in the collection "Charitas" (Petersburg, 1894), in the Lusatian periodical "Užica" (Budyszyn) and others.

For several years (1893-1900) her reviews of the political, social and artistic life of Krakow and Galicia were published in the newspaper "Kraj" (Petersburg) under pseudonyms.