| Lawrence Leroy Piersol | |
| Office: | Senior Judge of the United States District Court for the District of South Dakota |
| Term Start: | July 31, 2009 |
| Office1: | Chief Judge of the United States District Court for the District of South Dakota |
| Term Start1: | 1999 |
| Term End1: | 2005 |
| Predecessor1: | Richard Battey |
| Successor1: | Karen Schreier |
| Office2: | Judge of the United States District Court for the District of South Dakota |
| Term Start2: | November 22, 1993 |
| Term End2: | July 31, 2009 |
| Appointer2: | Bill Clinton |
| Predecessor2: | Donald James Porter |
| Successor2: | Jeffrey L. Viken |
| Birth Name: | Lawrence Leroy Piersol |
| Birth Date: | 21 October 1940 |
| Birth Place: | Vermillion, South Dakota |
| Party: | Democratic |
| Allegiance: |  United States |
| Rank: | Captain |
| Unit: | J.A.G. Corps |
| Serviceyears: | 1965-1968 |
Lawrence Leroy Piersol (born October 21, 1940) is a senior United States district judge of the United States District Court for the District of South Dakota.
Born in Vermillion, South Dakota, Piersol received a Bachelor of Arts degree from the University of South Dakota in 1962 and a Juris Doctor from the University of South Dakota School of Law in 1965.
Piersol attended The Judge Advocate General's Legal Center and School at the University of Virginia and entered Judge Advocate General's Corps, United States Army, where he served in from 1965 to 1968. He was in private practice in Sioux Falls, South Dakota from 1968 to 1993. A member of the Democratic Party, he served in the South Dakota House of Representatives, serving as Minority Whip (1971 to 1972) and Majority Leader (1973 to 1974).[1]
On August 6, 1993, Piersol was nominated by President Bill Clinton to a seat on the United States District Court for the District of South Dakota vacated by Donald James Porter. Piersol was confirmed by the United States Senate on November 20, 1993, and received his commission on November 22, 1993. He served as chief judge from 1999 to 2005 and assumed senior status on July 31, 2009.