Taiwan Retrocession Day is observed in Taiwan every October 25, commemorating the end of Japanese rule over the island in 1945. This observance marks the official return of Taiwan to the Republic of China after Japan's defeat in World War II. Taiwan had been a Japanese colony since 1895, following the Treaty of Shimonoseki, which ceded the island to Japan after the First Sino-Japanese War. Although not an official public holiday, various civilian organizations and individuals participate in memorial activities to honor this significant historical event. Notably, the Taipei City Government organized small-scale ceremonies during the 65th anniversary of retrocession in 2010. The day serves as a reminder of Taiwan's complex history and its transition from Japanese rule to its current status.