Elena Maria Catargiu-Obrenović (Serbian Cyrillic: Елена Марија Катарџи-Обреновић; 1831 Iași – 16 July 1876 or 28 June 1879, Dresden), known in Serbia as Marija Obrenović, was a Moldavian and Romanian boyaress. She was the daughter of Costin Catargi(u), a great landowner and Moldavian separatist, the former wife (div. 1855) of Miloš Obrenović of Serbia (1829–1861), the mistress of Domnitor Alexandru Ioan Cuza of Moldavia and Wallachia (1820–1873), and the mother of King Milan I of Serbia, Alexandru Al. Ioan Cuza and Dimitrie Cuza. Her younger sons, Dimitrie committed suicide in 1888 and Alexandru died the following year.
- Milan I of Serbia (1854–1901)
- Alexandru Al. Ioan Cuza (born between 1862 and 1864, died 1889)
- Dimitrie Cuza (1865–1888)