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Henry Loucks (1846–1928) was a newspaper editor and politician in the Dakota Territory, United States.
Henry Langford Loucks was born in Canada of Luxembourger-German and Irish immigrants. In 1890, he was nominated by members of the Farmers' Alliance as candidate for governor of South Dakota for the Independent Party, a precursor to the People's Party (United States). However, he lost to Arthur C. Mellette.
He was also the editor of the Dakota Ruralist newspaper.
One of his sons, Daniel K. Loucks, was the Speaker of the South Dakota House of Representatives.