Father Damien, also Blessed Damien of Molokai and born Joseph de Veuster (January 3, 1840 – April 15, 1889), was a Roman Catholic priest from Belgium and member of the Congregation of the Sacred Hearts of Jesus and Mary, a missionary religious order.

Damien is most noted for his devotion to caring and ministering to people with what was then widely known as leprosy, forced by government-sanctioned medical segregation, living on the island of Molokai in the Kingdom of Hawaii. In the Roman Catholic and Anglican traditions, as well as other denominations of Christianity, Damien is considered the spiritual patron for Hansen's Disease, HIV and AIDS patients as well as outcasts. As the patron saint of the Roman Catholic Diocese of Honolulu and of Hawaii, Father Damien Day is celebrated statewide on April 15. Upon his beatification towards canonization and sainthood by Pope John Paul II in 1995, Damien was given a memorial feast day, celebrated on May 10 on the church calendar and was conferred the official title of Blessed Damien of Molokai.

Several memorials have been made to Damien worldwide. The Father Damien Statue honors the priest in bronze at the United States Capitol while a full size replica stands in front of the Hawaii State Capitol. In 2005, Damien was honored with the title of De Grootste Belg, chosen as The Greatest Belgian throughout Belgian history in polling conducted by the Flemish public broadcasting service, VRT.

In both ecumenical religious and non-sectarian communities, Damien is being adopted as the symbol of how society should treat HIV/AIDS patients in defiance of the misconceptions of the disease, much like leprosy treatment was an outgrowth of misconceptions. Several Damien Centers have been established worldwide to serve people diagnosed with HIV/AIDS.

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