V Day is a specific calendar day in celebration of victory, it may refer to different holidays in different nations:

• V-E Day (Victory in Europe Day) is the formal day of celebration by the Allies over Nazi Germany in World War II.
• V-J Day (Victory over Japan Day) is the formal day of celebration by the Allies over Japan in World War II.
• Victory Day is the formal date of the celebration by the USSR of the capitulation of Nazi Germany.

Noted Feminist Eve Ensler, the author of The Vagina Monologues, has set up a holiday with the name V Day on February 14, in order to help end domestic violence towards women.