National Unity Day, Union Day, Unification Day may refer to:

National unification

Alphabetic by country. * National Unity Day (Belarus), a holiday in Belarus on September 17 * Unification Day (Bulgaria), a holiday in Bulgaria on September 6 * Unity Day (Burundi), a holiday in Burundi on February 5 * National Unity Day, a holiday in Georgia on April 9 * National Unity Day, a holiday in Hungary on June 4 * German Unity Day, a holiday in Germany on October 3 * National Unity Day (India), a holiday in India on October 31 * Kazakhstan People's Unity Day, a holiday in Kazakhstan on May 1 * Great Union Day, a holiday in Romania on December 1 * Unity Day (Russia), a holiday in Russia on November 4 * Unity Day (Tajikistan), a holiday in Tajikistan on June 27 * Day of Unity of Ukraine, a holiday in Ukraine on January 22 * Unity Day (United States), a holiday in the United States in October * Unity Day (Vanuatu), a holiday in Vanuatu on November 29 * Unity Day (Yemen), a holiday in Yemen on May 22 * Unity Day (Zambia), a holiday in Zambia on the day after Heroes' Day * Unity Day (Zimbabwe), a holiday in Zimbabwe on December 22

Community unity celebrations

* Unity Day (Leeds), a free open air festival in Leeds in early August * Unity Day (Philadelphia), a celebration in August in Philadelphia {{disambiguation