| Walter Dieckmann | |
| Birth Date: | 8 October 1869 |
| Birth Place: | Hamburg, Germany |
| Death Place: | Munich, Germany |
| Work Institution: | BASF, University of Munich |
| Alma Mater: | University of Munich |
| Known For: | Dieckmann condensation |
Walter Dieckmann (8 October 1869 – 12 January 1925) was a German chemist. He is the namesake of the Dieckmann condensation, the intramolecular reaction of diesters with base to give β-keto esters.
Dieckmann studied at the University of Munich and became assistant of Adolf von Baeyer.