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 first Tuesday of July
• 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

This disambiguation page lists articles associated with the title Unity Day.
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