On 30 March 1885, Eiffel presented his plans to the Société des Ingénieurs Civils; after discussing the technical problems and emphasising the practical uses of the tower, he finished his talk by saying the tower would symbolise: Not only the art of the modern engineer, but also the century of Industrand Science in which we are living, and for which the way was prepared by the great scientific movement of the eighteenth century and by the Revolution of 1789, to which this monument will be built as an expression of France's gratitude.

The Sarawak People's Guerilla Force was formed on 30 March 1964 at Mount Asuansang in West Kalimantan with the assistance of the Indonesian Ministry of Foreign Affairs. The SPGF's leaders included Bong Kee Chok, Yang Chu Chung, and Wen Ming Chyuan.

On 30 March 1970, Wen Ming Chyuan, the Head of the Sarawak People's Guerrillas in Sarawak's First Division, formed the North Kalimantan Communist Party.

By 30 March 100,000 leaderless ARVN troops surrendered as the NVA marched victoriously through Da Nang. With the fall of the city, the defense of the Central Highlands and Northern provinces came to an end.

James Urban Ruppert is an American murderer, who was responsible for one of the deadliest shootings inside a private residence in US history. On Easter Sunday, March 30, 1975, Ruppert murdered 11 family members in his mother's house at 635 Minor Avenue in Hamilton, Ohio in what has been referred to as the "Easter Sunday Massacre." He is serving two life sentences at the Allen Oakwood Correctional Institution in Lima, Ohio.