Lou Henry Hoover, American wife of Herbert Hoover, 33rd First Lady of the United States (d. 1944)
Lou Hoover (née Henry; March 29, 1874 – January 7, 1944) was the wife of President Herbert Hoover and served as the first lady of the United States from 1929 to 1933.

Marrying her geologist and mining engineer husband in 1899, she traveled widely with him, including to Shanghai, China, and became a cultivated scholar and linguist. She made extensive study of languages including Latin, Mandarin Chinese, Spanish, German, Italian and French. As First Lady, she oversaw construction of the presidential retreat at Rapidan Camp in Madison County, Virginia, and was the first First Lady to make regular nationwide radio broadcasts.