Harold Albert Loeb (1891–1974) was an American writer, notable as an important American figure in the arts among expatriates in Paris in the 1920s. In 1921 he was the founding editor of Broom, an international literary and art magazine, which was first published in New York City before he moved the venture to Europe. Loeb published two novels while living in Paris in the 1920s, and additional works after returning to New York in 1929.
Harold Albert Loeb was born into a wealthy ethnic German Jewish family in New York City. His mother Rose was related to the Guggenheims; one of his cousins was Peggy Guggenheim. His father Albert was a successful investment banker with Kuhn, Loeb & Company. The young Loeb attended Princeton University, where he earned his B.A. in 1913. After earning his degree, he moved to Empress, Alberta, Canada, working on a ranch and later laying concrete for the Canadian Pacific Railway.
In 1914, Loeb returned to New York, where he married Marjorie Content, daughter of a wealthy stockbroker and his wife. They returned to a rural life in Alberta for a period, where their son and daughter were born in 1915 and 1916, respectively.
The United Kingdom's declaration of war on Germany made it impossible for Loeb to continue working as a foreigner in Canada. In 1917, the Loebs returned to New York. The next year, Loeb moved to San Francisco, where he worked for the Guggenheims as a purchaser for the American Smelting and Refining Company. When the United States entered the war, Loeb joined the military. Due to his poor eyesight, Loeb was not sent overseas but assigned to a desk job in New York.
After the war, Loeb became partial owner in New York of the bookstore The Sunwise Turn. While working at the Sunwise Turn, he met several young writers, including F. Scott Fitzgerald, Laurence Vail, and Malcolm Cowley.