Helen Maria Williams was a British novelist, poet, and translator of French-language works. A religious dissenter, she was a supporter of abolitionism and of the ideals of the French Revolution; she was imprisoned in Paris during the Reign of Terror, but nonetheless spent much of the rest of her life in France. A controversial figure in her own time, the young Williams was favourably portrayed in a 1787 poem by William Wordsworth.

Helen Marot was an American writer, librarian, and labor organizer. She is best remembered for her efforts to address child labor and improve the working conditions of women. She was from Philadelphia and became active in investigating working conditions among children and women. As a librarian, she worked at several important institutions and helped organize the Free Library of Economics and Political Science in 1897. Marot was a member of the Women's Trade Union League. She later organized the Bookkeepers, Stenographers and Accountants Union in New York. In 1912, she was part of a commission that investigated the Triangle Shirtwaist Factory Fire. She was an active writer and her articles about the labor movement appeared in many periodicals of the day.

Helen Parry Eden was an English poet. She is credited with making popular in English the phrase "bread and circuses".

Helen Reimensnyder Martin was an American author.

Helen May Rowland was an American journalist and humorist. For many years she wrote a column in the New York World called "Reflections of a Bachelor Girl". Many of her pithy insights from these columns were published in book form, including Reflections of a Bachelor Girl (1909), The Rubáiyát of a Bachelor (1915), and A Guide to Men (1922).

Helen Sherman Griffith was an American author. An Iowan, she was the "prolific" author of the Letty Grey series of children's books, published by Penn Publishing Company of Philadelphia. She was the daughter of Hoyt Sherman and Sara Sherman, who was born and raised in Des Moines, Iowa at Hoyt Sherman Place. Helen's bedroom has been restored and is part of the Hoyt Sherman Place house museum.

Helen Zimmern was a naturalised British writer and translator born in Germany. She was instrumental in making European culture more accessible in English.

Helena Petrovna Blavatsky, often known as Madame Blavatsky, was a Russian mystic and author who co-founded the Theosophical Society in 1875. She gained an international following as the leading theoretician of Theosophy.

Henri (Hendrik) Conscience was a Belgian author. He is considered the pioneer of Dutch-language literature in Flanders, writing at a time when Belgium was dominated by the French language among the upper classes, in literature and government. Conscience fought as a Belgian revolutionary in 1830 and was a notable writer in the Romanticist style popular in the early 19th century. He is best known for his romantic nationalist novel, The Lion of Flanders (1838), inspired by the victory of a Flemish peasant militia over French knights at the 1302 Battle of the Golden Spurs during the Franco-Flemish War.

Hendrik Willem van Loon was a Dutch-American historian, journalist, and children's book author.