| David M. Key | 
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| In office May 27, 1880 – January 21, 1895
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| Appointed by | Rutherford B. Hayes | 
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| Preceded by | Connally Findlay Trigg | 
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| Succeeded by | Charles Dickens Clark | 
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| In office March 12, 1877 – June 2, 1880
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| President | Rutherford B. Hayes | 
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| Preceded by | James Noble Tyner | 
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| Succeeded by | Horace Maynard | 
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| In office August 18, 1875 – January 19, 1877
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| Appointed by | James D. Porter | 
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| Preceded by | Andrew Johnson | 
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| Succeeded by | James E. Bailey | 
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| Born | David McKendree Key (1824-01-27)January 27, 1824
 Greeneville, Tennessee
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| Died | February 3, 1900(1900-02-03) (aged 76) Chattanooga, Tennessee
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| Resting place | Forest Hill Cemetery Chattanooga, Tennessee
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| Political party | Democratic | 
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| Education | Hiwassee College University of Tennessee (A.M.)
 read law
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| Signature |  | 
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| Allegiance | Confederate States | 
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| Branch/service | Confederate States Army | 
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| Years of service | 1861–1865 | 
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| Rank | Lieutenant colonel | 
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| Unit | 43rd Tennessee Regiment | 
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| Battles/wars | American Civil War | 
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David McKendree Key (January 27, 1824 – February 3, 1900) was a United States senator from Tennessee, United States Postmaster General and a United States district judge of the United States District Court for the Eastern District of Tennessee and the United States District Court for the Middle District of Tennessee.