| San Martín River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Mexico |
| Subdivision Type2: | State |
| Subdivision Name2: | Jalisco |
| Subdivision Type5: | Cities |
| Subdivision Name5: | Santa Cruz de las Flores, San Martín de Hidalgo, Los Vergara, Labor de Medina, El Cabezón |
| Length: | 10miles |
| Source1: | Sierra de Quila, Mesa de Ramos |
| Source1 Location: | San Martín de Hidalgo, Región Valles, Jalisco, Mexico |
| Tributaries Left: | Arroyo Las Minas |
| Tributaries Right: | Arroyo de Río Grande |
The San Martín River is a tributary of the main stem Ameca River, which drains into the Bahía de Banderas of the Pacific Ocean, near Puerto Vallarta, Jalisco. The river derives its name from the city of San Martín de Hidalgo, the largest town it flows through.[1] It is fed from various smaller tributaries which rise from the Mesa de Ramos in the west and the Sierra de Quila in the south.