| Clarence L. Kooistra | |
| State Senate: | South Dakota |
| District: | 25th |
| Term Start: | 2003 |
| Term End: | 2006 |
| Predecessor: | Jim Hutmacher |
| Successor: | Arnie Hauge |
| State House2: | South Dakota |
| District2: | 25th |
| Term Start2: | 1997 |
| Term End2: | 2002 |
| Birth Date: | 25 January 1941 |
| Birth Place: | Canova, South Dakota |
| Party: | Democratic, formerly Republican |
| Spouse: | Arlene Kay Fiskvik |
| Profession: | teacher |
| Residence: | Garretson, South Dakota |
| Children: | two |
Clarence L. Kooistra (born January 25, 1941) is an American former politician. He served in the South Dakota House of Representatives from 1997 to 2002 and in the Senate from 2003 to 2006.[1] [2]
After losing renomination in 2006, Kooistra joined the South Dakota Democratic Party.[3]