List of Famous people born in May

Ranko Matasović is a Croatian linguist, Indo-Europeanist and Celticist.

José Isidro Guerrero Macías was a Mexican Roman Catholic prelate.

José Câmnate na Bissign is a Guinea-Bissauan Roman Catholic bishop. He was the first native bishop of Guinea-Bissau, serving from 2000 to 2020.

José Arturo Cepeda, is a Mexican-American prelate of the Roman Catholic Church who serves as an auxiliary bishop for the Roman Catholic Archdiocese of Detroit.

Joseph William Kennedy was an American chemist who was a co-discoverer of plutonium, along with Glenn T. Seaborg, Edwin McMillan and Arthur Wahl. During World War II he was head of the CM Division at the Manhattan Project's Los Alamos Laboratory, where he oversaw research onto the chemistry and metallurgy of uranium and plutonium. After the war, he was recruited as a professor at Washington University in St. Louis, where he is credited with transforming a university primarily concerned with undergraduate teaching into one that also boasts strong graduate and research programs. He died of cancer of the stomach at the age of 40.

Joseph Spiteri is a Maltese prelate of the Catholic Church who works in the diplomatic service of the Holy See. He has been Apostolic Nuncio to Lebanon since March 2018.