| Machnín | |
| Settlement Type: | Village |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Liberec |
| Subdivision Type2: | District |
| Subdivision Name2: | Liberec |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Liberec |
| Pushpin Map: | Czech Republic |
| Pushpin Relief: | 1 |
| Pushpin Map Caption: | Location in the Czech Republic |
| Coordinates: | 50.7908°N 14.9917°W |
| Established Title: | First mentioned |
| Established Date: | 1428 |
| Elevation M: | 350 |
| Population As Of: | 2011 |
| Population Total: | 1080 |
| Population Density Km2: | auto |
| Postal Code Type: | Postal code |
| Postal Code: | 460 01 |
Machnín (German: Machendorf), officially Liberec XXXIII-Machnín, is a village and administrative part of the city of Liberec in the Czech Republic.
Formerly a village, Machnín was established somewhere in the 14th century by Donín's family, and was named after Burgrave Vilém of Donín's wife Machna. A former name for Machnín was Machnadorf, and some sources also refer to it as Mochendorf, Machndorf or Mochendorff. The first reference to it is found in records from 1428 which mention a battle between Jan Královec and the Sorbs.
From its beginnings, the history of the village was affected by its position on the boundary between Grabštejn and Frýdlant lordships, and by its proximity to the Hamrštejn Castle.