William Andrew Loomis (1892-1959) was an illustrator from the United States. He was born in New York, but spent most of his working life in Chicago. He is best remembered now for a series of art instruction books that continues to influence realist artists, though they are in 2004 all out of print, except for some excerpts available from the art publisher Walter Foster. The Loomis family, who still holds the copyrights to all the books published by Andrew Loomis, has not expressed any intention of re-printing any of his work in recent days despite popular demand.