India annexes Daman and Diu, part of Portuguese India.

The Annexation of Goa was the process in which the Republic of India annexed the Portuguese State of India, the then Portuguese Indian territories of Goa, Daman and Diu, starting with the armed action carried out by the Indian Armed Forces in December 1961. In India, this action is referred to as the "Liberation of Goa". In Portugal, it is referred to as the "Invasion of Goa". Jawaharlal Nehru had hoped that the popular movement in Goa and the pressure of world public opinion would force the Portuguese Goan authorities to grant it independence, but without success; consequently, Krishna Menon suggested taking Goa by force.

Daman and Diu was a union territory in northwestern India. With an area of 112 km² (43 sq mi), it was the smallest administrative subdivision of India on the mainland. The territory comprised two districts, Daman and Diu Island, geographically separated by the Gulf of Khambat. The state of Gujarat and the Arabian Sea bordered the territory. A Portuguese colony since the 1500s, these territories were taken over by India with the Annexation of Goa in 1961. Daman and Diu were administered as part of the union territory of Goa, Daman and Diu between 1961 and 1987. After the Goa Opinion Poll, they became separate union territories. In 2019, a legislation was passed to merge the union territories of Daman and Diu with its neighbouring union territory, Dadra and Nagar Haveli, to form the new union territory of Dadra and Nagar Haveli and Daman and Diu with effect from 26 January 2020.

The State of India, also known as the Portuguese State of India or Portuguese India, was a state of the Portuguese Empire founded seven years after the discovery of the sea route to the Indian subcontinent by Vasco da Gama, a subject of the Kingdom of Portugal. The capital of Portuguese India served as the governing centre of a string of military forts and maritime ports scattered along the coasts of the Indian Ocean.