Hilda Cathy Heine (born 6 April 1951) is a Marshallese educator and politician. She has served as the president of the Marshall Islands since 2024, having previously served from 2016 to 2020. Heine was the first woman to lead any sovereign country in Micronesia and the first person from the Marshall Islands to earn a doctorate. Prior to entering politics, she worked as a teacher and counselor at Marshall Islands High School and then as a women's rights activist with her organization Women United Together Marshall Islands.
Heine's political career began when she was elected to the Nitijeļā in 2011 and appointed Minister of Education. The legislature selected her for the presidency two weeks into the session in January 2016 after a motion of no confidence removed her predecessor, Casten Nemra. Her defection to the opposition alongside her two sons, also legislators, was pivotal in Nemra's removal. After becoming president, Heine became active in the international politics surrounding climate change. She survived a motion of no confidence in 2018 following a dispute regarding the designation of Rongelap Atoll, with later investigation determining that some of her opponents in this motion had been bribed by developers who wished to use the atoll.