| Country: | MEX |
| Type: | FH |
| Route: | 43 |
| Maint: | Secretariat of Communications and Transportation |
| Length Km: | 107.95 |
| Length Round: | 2 |
| Length Ref: | [1] |
| Direction A: | North |
| Terminus A: | in Salamanca |
| Junction: | west of Yuriria[2] southwest of Yuriria[3] south of Cuitzeo in San Juan Benito Juárez[4] near San Juan Benito Juárez in San José, Michoacán[5] |
| Direction B: | South |
| Terminus B: | Morelia, Michoacán |
| Previous Type: | FH |
| Previous Route: | 41 |
| Next Type: | FH |
| Next Route: | 44 |
Federal Highway 43 (Carretera Federal 43) (Fed. 43) is a free (libre) part of the federal highways corridors (los corredores carreteros federales) of Mexico.[6]
Fed. 43 connects the city of Salamanca, Guanajuato in the north to the capital of Michoacán, Morelia in the south. Near Morelia it begins as a highway to cross the bridge over Lake Cuitzeo, just north of the intersection of Fed. 15. From there it is a narrow road and is 2 lanes wide in places. The highway connects the cities of Cuitzeo, Moroleón, Uriangato and Valle de Santiago. A motorway fee is now charged.