La Union Day, observed in the Philippine province of La Union, is celebrated every March 2 to commemorate the province's founding anniversary. La Union was officially established on March 2, 1850, becoming the 34th province of the Philippines, with Queen Isabella II of Spain confirming its establishment in 1854. The province, located in Luzon, was formed from territories originally part of Pangasinan, and it developed rapidly due to the lucrative tobacco industry initiated by the Spanish colonizers. Celebrations of La Union Day often extend beyond a single day, featuring various festive events such as beauty pageants, exhibitions, tournaments, parades, food festivals, and thanksgiving ceremonies. In 2023, for instance, the festivities lasted from February 25 to March 28, showcasing the province's rich culture and heritage.