| District: | 18th |
| State Senate: | Iowa |
| Term: | 1955–1967 |
| Party: | Republican |
| Prior Term: | 22nd district (1955–1963) |
| District1: | 45th |
| State House1: | Iowa |
| Term1: | 1953–1955 |
| Birth Date: | 18 February 1924 |
| Birth Place: | Clinton, Iowa |
| Children: | 4 |
| Alma Mater: | University of Iowa |
David O. Shaff (February 18, 1924 – September 14, 2011)[1] was a state legislator of Iowa who proposed the rejected Shaff Plan in 1963.[2] He was from Clinton, Iowa. After serving in the United States Air Force in World War II,[3] he attended the University of Iowa, where he obtained both a Bachelor of Arts and a Juris Doctor. He served one term in the Iowa House of Representatives, from 1953 to 1955, before serving three terms in the Iowa Senate, from 1955 to 1967.