Sir Hugh Seymour Walpole, CBE was an English novelist. He was the son of an Anglican clergyman, intended for a career in the church but drawn instead to writing. Among those who encouraged him were the authors Henry James and Arnold Bennett. His skill at scene-setting and vivid plots, as well as his high profile as a lecturer, brought him a large readership in the United Kingdom and North America. He was a best-selling author in the 1920s and 1930s but has been largely neglected since his death.

Hugo Gernsback was a Luxembourgish–American editor and magazine publisher, whose publications included the first science fiction magazine, Amazing Stories. His contributions to the genre as publisher were so significant that, along with the novelists H. G. Wells and Jules Verne, he is sometimes called "The Father of Science Fiction". In his honor, annual awards presented at the World Science Fiction Convention are named the "Hugos".

Hugo Grotius, also known as Huig de Groot and Hugo de Groot, was a Dutch humanist, diplomat, lawyer, theologian, jurist, statesman, poet and playwright. A teenage prodigy, he was born in Delft and studied at Leiden University. He was imprisoned in Loevestein Castle for his involvement in the controversies over religious policy of the Dutch Republic, but escaped hidden in a chest of books that was transported to Gorinchem. Grotius wrote most of his major works in exile in France.

Hugo Magnus was a German ophthalmologist and historian of medicine. He was of Jewish ancestry.

Hugo Münsterberg was a German-American psychologist. He was one of the pioneers in applied psychology, extending his research and theories to industrial/organizational (I/O), legal, medical, clinical, educational and business settings. Münsterberg experienced immense turmoil with the outbreak of the First World War. Torn between his loyalty to the United States and his homeland, he often defended Germany's actions, attracting highly contrasting reactions.

Hugo Richard Meyer was an American author and economist concerned with public ownership of telegraph, phone, railway and other utilities.

Hulbert Footner was a Canadian born American writer of primarily detective fiction. He also wrote some non-fiction.

Humbert Wolfe CB CBE was an Italian-born British poet, man of letters and civil servant.

James Hume Nisbet was a Scottish-born novelist and artist. Many of his thrillers are set in Australia.

David Hutton Webster was an American sociologist, economist and anthropologist. He was Lecturer Emeritus of Sociology at Stanford University.