2 September: The Ukrainian-flagged vessel Rostock[ro] ran aground and sank in the Sulina branch of the Danube, near Partizani village, partially blocking traffic; the last piece of the wreck was brought to the surface 14 years later.[4]
26 September – September 1991 Mineriad: The Jiu Valley miners return to Victory Square. Here take place negotiations with doors closed, between representatives of the miners and the country's leadership. The ensuing resignation of the second Petre Roman cabinet is announced at 12:30pm from the balcony of Victoria Palace. In the evening, the miners try to break into the headquarters of the Romanian Television. Here take place scenes of violence and vandalism.
8 December – Is adopted, through a national referendum, the new Constitution of Romania, approved by the Constituent Assembly on 21 November 1991; development, discussion and adoption of the Constitution lasted a year and a half.
12 December – Supreme Court of Justice, Department of Military, declares not guilty the former members of the Political Executive Committee of the Romanian Communist Party.