| Harmankaya Canyon Nature Park | |
| Alt Name: | Harmankaya Kanyonu Tabiat Parkı |
| Map: | Turkey |
| Relief: | yes |
| Label Position: | right |
| Label: | Harmankaya Canyon NP |
| Location: | Karahasanlar, Yenipazar and Harmanköy, İnhisar villages, Bilecik Province, Turkey |
| Coordinates: | 40.1486°N 30.4408°W |
| Governing Body: | Directorate-General of Nature Protection and National Parks Ministry of Environment and Forest |
Harmankaya Canyon Nature Park (Turkish: Harmankaya Kanyonu Tabiat Parkı) is a canyon in Bilecik Province, western Turkey, which was declared a nature park.
The canyon is located between Karahasanlar village in Yenipazar district and Harmanköy village in İnhisar of Bilecik. Its distance to Karahasanlar village is and to Harmanköy about . The canyon's northern entrance is at an elevation of, the southern entrance is at while the elevation in the canyon mid measures about . It is about long, and its entrance is around wide. The canyon cliffs are high. There are two waterfalls of about height, and many others of height. The area covering was declared as the country's 184th nature park by the Ministry of Environment and Forest on December 26, 2012.
The vegetation of the nature park consists of low trees and shrubs like oak (Quercus), juniper (Juniperus), rowan (Sorbus), terebinth (Pistacia terebinthus), willow (Salix,) and blackthorn (Prunus spinosa).