Little Union may refer to:
The unification of Moldavia and Wallachia, which founded modern Romania, in 1859, commonly known in the country as the ("Little Union", also translated as the "Small Union") The Day of the Unification of the Romanian Principalities, a holiday commemorating this event, sometimes known as the Little Union Day Little Union, Missouri, unincorporated community in Marion County in Missouri, in the United States The Little Union River, a river in the United States