| Country: | MEX |
| Type: | FH |
| Route: | 37 |
| Maint: | Secretariat of Communications and Transportation |
| Length Km: | 530.3 |
| Section1: | North segment |
| Length Km1: | 117 |
| Length Ref1: | [1] |
| Direction A1: | North |
| Terminus A1: | in Villa de Zaragoza, San Luis Potosí[2] |
| Direction B1: | South |
| Terminus B1: | in San Felipe |
| Section2: | South segment |
| Length Km2: | 413.3 |
| Length Ref2: | [3] |
| Direction A2: | North |
| Terminus A2: | Manuel Doblado |
| Junction2: | east of La Piedad in La Mira, Michoacán |
| Direction B2: | South |
| Terminus B2: | Playa Azul |
| Previous Type: | FH |
| Previous Route: | 36 |
| Next Type: | FH |
| Next Route: | 39 |
Federal Highway 37 (Spanish; Castilian: '''Carretera Federal 37''', Fed. 37) is a free part of the federal highways corridors (Spanish; Castilian: los corredores carreteros federales) of Mexico.[4] The highway runs from Villa de Zaragoza, San Luis Potosí, at its northern point to Playa Azul, Michoacán, located near the Pacific Ocean, at its southern point, near the port city of Lázaro Cárdenas, Michoacán.[5] It crosses Fed. 14 at Uruapan, Michoacán, and Federal Highway 200 at La Mira, Michoacan.
Fed. 37 runs in two separate improved segments: the first segment runs from Villa de Zaragoza to San Felipe, Guanajuato. The second segment runs from Manuel Doblado, Guanajuato, to Playa Azul at Fed. 200. The two segments are connected via GTO 77 and Fed. 84-JAL 80.[6] The highway is partly paralleled by Federal Highway 37D.