Hugh Parker Guiler (February 15, 1898 – January 7, 1985), also known as Ian Hugo, was Anaïs Nin's husband from 1923 until her death in 1977, and a skilled engraver and filmmaker in his own right.

In 1940, he took up engraving and etching, studying under Stanley William Hayter of Atelier 17 in Paris, producing surreal images that often accompanied Nin's books.

His successful banking career supported the artistic work of not only his wife but also her lover, Henry Miller, and to a lesser extent various others.

Starting in 1966, when the first of Anaïs’s diaries was published, her late-life literary success provided crucial financial support for them both.

Hugo lived the last two decades of his life in New York City, dictating his memoirs and continuing his engraving and filmmaking work.