HI or Hi may refer to:
Hinduism is an Indian religion and dharma, or way of life, widely practised in the Indian subcontinent and parts of Southeast Asia.
Hillary Rodham Clinton (née Hillary Diane Rodham; born October 26, 1947) is an American politician, diplomat, lawyer, writer and public speaker.
Hilary Erhard Duff (born September 28, 1987) is an American actress, singer, songwriter, designer, producer and author.
Hindi (Devanagari: हिन्दी, IAST: Hindī), or Modern Standard Hindi (Devanagari: मानक हिन्दी, IAST: Mānak Hindī) is a standardised and Sanskritised register of the Hindustani language.
Human immunodeficiency virus infection and acquired immune deficiency syndrome (HIV/AIDS) is a spectrum of conditions caused by infection with the human immunodeficiency virus (HIV).
Hirohito (裕仁, 29 April 1901 – 7 January 1989) was the 124th Emperor of Japan according to the traditional order of succession, reigning from 25 December 1926, until his death on 7 January 1989. He was succeeded by his eldest son, Akihito.
The history of the United States, a country in North America, began with the settlement of Indigenous people before 15,000 BC.
The Higgs boson is an elementary particle in the Standard Model of particle physics, produced by the quantum excitation of the Higgs field, one of the fields in particle physics theory.