| Leen Buis | |
| Birth Date: | 5 December 1906 |
| Birth Place: | Zwanenburg, Netherlands |
| Death Place: | Amsterdam, Netherlands |
Leendert "Leen" Buis (5 December 1906 - 17 November 1986) was a Dutch road cyclist. He competed in the 1928 Summer Olympics, finishing 17th individually and 9th in the team competition.