Portland Museum

Portland Museum may refer to:


 * Portland Museum (Louisville), Louisville, Kentucky, USA
 * Portland Museum, Dorset, England (on the Isle of Portland)
 * Portland Museum of Art, Maine, USA
 * Portland Art Museum, Oregon, USA
 * Portland Children's Museum, Oregon, USA
 * Portland Gallery, London, England
 * 'The Portland Museum', collection of Margaret Cavendish-Harley, Duchess of Portland, now dissolved