Against the Grain: Contemporary Art from the Edward R. Broida Collection, The Museum of Modern Art, New York, May 3–July 10, 2006.
Rosenwald-Wolf Gallery, The University of the Arts, Philadelphia, Pennsylvania. John Duff: Sculpture and a Situational Wall Drawing. Catalogue with text by Sid Sachs. (solo)
Weatherspoon Art Museum, University of North Carolina, Greensboro. John Duff: Falk Visiting Artist, September 18–December 11. Catalogue with text by Xandra Eden. (solo)
Elizabeth Leach Gallery, Portland, Oregon. 2-D from 3-D: Contemporary and Historical Drawings by Sculptors, October 6 – November 23, 2005.
Knoedler & Company, New York, NY. John Duff — Designed With You in Mind: Various Sculptures, Variously Entailed, January 29, 2003–March 13, 2004. Catalogue with essay by Elisabeth Sussman (solo)
American Academy of Arts & Letters, New York, NY. Invitational Exhibition of Painting and Sculpture.
Knoedler & Company, New York, New York. John Duff: Elements, Increments, Intervals, May 3–June 29. In conjunction with an exhibition at Baumgartner Gallery, New York, New York. (solo)
San Francisco Museum of Modern Art, San Francisco, CA. Celebrating Modern Art: The Anderson Collection. October 4, 2000–January 15, 2001.
Celebrating Modern Art, The Anderson Collection
40 Years of American Drawings, Raab Galerie Berlin
John Duff: Drawn into Form, Hill Gallery Birmingham, Michigan
Sculptors Draw, Rosenberg + Kaufman Fine Art New York
Best of the Season: Selected Work from 1996-1997, Aldrich Musuem of Contemporary Art Ridgefield, Connecticut
John Duff: Sculpture, Knoedler & Company New York
McKee Gallery New York
Le temp d'un dessin, Ecole des Beaux Arts de Lornet France
McKee Gallery New York
Galeria 57, Madrid
Red White Blue, Blum Helman Gallery New York
John Duff: Bronzes, catalog: text by John Yau, Blum Helman Gallery New York
Image and Mystery, Hill Gallery Birmingham, Michigan
John Duff: Recent Sculpture in Fiberglass, Margo Leavin Gallery Los Angeles
Casting: A Survey of Cast Metal Sculpture in the 80's, Fuller Goldeen Gallery San Francisco
John Duff Sculpture 1967-1979, catalog: text by Robert McDonald, Sonoma State University Art Gallery Rohnert Park, California
Selections, Willard Gallery New York
John Duff, Willard Gallery New York
Galerie Ricke Cologne
Albatross Gallery Newport Beach, California