Clarence Howard Johnston Sr. | |
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| Born | August 26, 1859 |
| Died | December 29, 1936 (aged 77) |
| Nationality | American |
| Occupation | Architect |
| Awards | Minnesota State Architect (1901-1931) Fellow, American Institute of Architects President, AIA Minnesota |
| Buildings | Summit Terrace, Glensheen Mansion, Minnesota State Prison, Walter Library, Northrop Auditorium |
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Clarence Howard Johnston Sr. (August 26, 1859 – December 29, 1936) was an American architect who practiced in the US state of Minnesota during the late 1800s and early 1900s. Specializing in domestic, religious, and public architecture, he served as Minnesota State Architect from 1901 to 1931. He is considered one of the most prolific architects in the state's history.