SmithGroup is an international architectural, engineering and planning firm based in Detroit, Michigan.

Established in 1853 by architect Sheldon Smith, SmithGroup is the longest continually operating architecture and engineering firm in the United States that is not a wholly owned subsidiary.

[3] As of 2019, it ranks among the top 50 architecture firms according to Architect Magazine, the official magazine of AIA[4] and also ranked as the 5th largest architecture/engineering firm in the U.S.[5] The firm is composed of client industry-focused practices serving Cultural, Government, Healthcare, Higher Education, Mixed-Use, Parks & Open Spaces, Science & Technology, Senior Living, Urban Environments, Waterfront and Workplace markets.

The firm has offices in 20 cities: Ann Arbor, Atlanta, Boston, Chicago, Cleveland, Dallas, Denver, Detroit, Houston, Los Angeles, Madison, Milwaukee, Phoenix, Pittsburgh, Portland, Sacramento, San Diego, San Francisco, Shanghai, and Washington, D.C.

[6] Notable architects and engineers from the firm include Wilfred Armster, C. Howard Crane, David DiLaura, Rainy Hamilton Jr., Robert F. Hastings, Julius Goldman, William Kapp, Wirt C. Rowland, Rosa T. Sheng and Minoru Yamasaki.