Chinese unification, also known as Cross-Strait unification or Chinese reunification, is the potential unification of territories currently controlled, or claimed, by the People's Republic of China and the Republic of China ("Taiwan") under one political entity, possibly the formation of a political union between the two republics. Together with full Taiwan independence, unification is one of the main proposals to address questions on the political status of Taiwan, which is a central focus of Cross-Strait relations.

Taiwan, officially the Republic of China (ROC), is a country in East Asia. It is located at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the northeast, and the Philippines to the south. The territories controlled by the ROC consist of 168 islands with a combined area of 36,193 square kilometres. The main island of Taiwan, also known as Formosa, has an area of 35,808 square kilometres, with mountain ranges dominating the eastern two-thirds and plains in the western third, where its highly urbanized population is concentrated. The capital, Taipei, forms along with New Taipei City and Keelung the largest metropolitan area. With around 23.9 million inhabitants, Taiwan is among the most densely populated countries.