Guy Diehl is an American artist best known for still life paintings and prints, many of which incorporate direct references to historically significant artists and artworks.

Diehl's work is included in numerous public collections including the Fine Art Museums of San Francisco, The Oakland Museum of California, The U.S. Department of State's Art Bank Program, Bank of America in San Francisco, the Cantor Arts Center at Stanford University, the Mansion at MGM Grand in Las Vegas, Princeton University, the Redding Museum, the Redwood City Library, the Southern California Gas Company in Los Angeles, the Ritz-Carlton in Washington, D.C., the Triton Museum of Art, and the Jane Voorhees Zimmerli Art Museum at Rutgers University.

Guy is represented by Dolby Chadwick Gallery in San Francisco, CA.