| Deerlijk | |
| Map: | Deerlijk West-Flanders Belgium Map.svg |
| Map-Legend: | Location of Deerlijk in West-Flanders |
| Arms: | Blason Deerlijk.svg |
| Flag: | Flag of Deerlijk.svg |
| Arrondissement: | Kortrijk |
| Nis: | 34009 |
| Mayor: | Claude Croes (CD&V) |
| Majority: | CD&V, Open Vld |
| Postal-Codes: | 8540 |
| Telephone-Area: | 056 |
| Web: | www.deerlijk.be |
| Coordinates: | 50.85°N 24°W |
Deerlijk (in Dutch; Flemish pronounced as /ˈdeːrlək/; Deirlyk) is a municipality located in the Belgian province of West Flanders. The municipality only comprises the town of Deerlijk proper. On January 1, 2006, Deerlijk had a total population of 11,310. The total area is 16.82 km² which gives a population density of 673 inhabitants per km².