Frank Polk
| Frank Lyon Polk | |
|---|---|
| Official portrait, 1920 | |
| 1st United States Under Secretary of State | |
| In office July 1, 1919 – June 15, 1920 | |
| President | Woodrow Wilson | 
| Preceded by | Office established | 
| Succeeded by | Norman Davis | 
| Acting United States Secretary of State | |
| In office February 14, 1920 – March 12, 1920 | |
| President | Woodrow Wilson | 
| Preceded by | Robert Lansing | 
| Succeeded by | Bainbridge Colby | 
| 4th Counselor of the United States Department of State | |
| In office September 16, 1915 – June 30, 1919 | |
| President | Woodrow Wilson | 
| Preceded by | Robert Lansing | 
| Succeeded by | R. Walton Moore | 
| Personal details | |
| Born | September 13, 1871 New York City, U.S. | 
| Died | February 7, 1943 (aged 71) New York City, U.S. | 
| Political party | Democratic | 
| Spouse | Elizabeth Sturgis Potter | 
| Children | 5 | 
| Alma mater | Yale College (B.A.) Columbia Law School (LL.D.) | 
Frank Lyon Polk (September 13, 1871 – February 7, 1943) was an American lawyer and diplomat, who was also a name partner of the law firm today known as Davis Polk & Wardwell.