| Canton of Mersch | |
| Settlement Type: | Canton |
| Coordinates: | 49.7°N 12°W |
| Subdivision Type: | Country |
| Subdivision Name: | Luxembourg |
| Subdivision Type1: | Legislative constituency |
| Subdivision Name1: | Centre |
| Subdivision Type2: | LAU 1 |
| Subdivision Name2: | LU00004 |
| Area Total Km2: | 223.9 |
| Area Rank: | 6th of 12 |
| Elevation Max M: | 436 |
| Elevation Max Footnotes: | (6th of 12) |
| Elevation Min M: | 201 |
| Elevation Min Footnotes: | (6th of 12) |
| Population Rank: | 5th of 12 |
| Population Density Km2: | auto |
| Population Density Rank: | 6th of 12 |
| Parts Type: | Communes (cities in bold) |
| Parts Style: | para |
| P1: | Bissen Colmar-Berg Fischbach Heffingen Helperknapp Larochette Lintgen Lorentzweiler Mersch Nommern |
Mersch (Luxembourgish; Letzeburgesch: Miersch) is a canton in the centre of Luxembourg. It is the only canton, other than Luxembourg, to be entirely surrounded by other cantons, and therefore not to have an international boundary.
Mersch Canton consists of the following ten communes: