American Painting 1970, Virginia Museum of Fine Arts, Richmond
Summer Time, Galerie Beyeler, Basel, Switzerland
Paintings and Drawings by Reginald Marsh - Paintings and Sculptures of Our Times, Museum of Art, Ogunquit
Against Order and Chance, Institute of Contemporary Art, University of Pennsylvania, Philadelphia
L'art vivant aux Etats-Unis, Fondation Maeght, Saint Paul de Vence, France
1970/71
Pittsburgh International Exhibition of Contemporary Art, Museum of Art, Carnegie Institute, Pittsburgh
1971
One Hundred and Forty-Sixth Annual Exhibition. Oil Painting, Sculpture, Graphic Arts, Watercolor, National Academy of Design, New York
Drawings USA/71, Minnesota Museum of Art, Saint Paul
Inner Spaces / Outer Limits, Lerner-Misrachi Gallery, New York
"Was die Schönheit sei, das weiß ich nicht". Künstler - Theorie - Werk. 2. Biennale Nürnberg 1971, Germany
1971/72
Drawings in Saint Paul from the permanent collection of the Minnesota Museum of Art, Minnesota Museum of Art, Saint Paul
1972
From the 'Fifties'. A Selection of Works on Paper, Martha Jackson Gallery, New York
Art of the Thirties. The Pacific Northwest, Henry Art Gallery, University of Washington, Seattle
Spring, Willard Gallery, New York
Paintings by Harmon Neil - Painting and Sculpture by Americans of Our Times, Museum of Art, Ogunquit
Von Venus zu Venus, Galerie Beyeler, Basel, Switzerland