| Martin River | |
| Map Size: | 300 |
| Pushpin Map: | USA Alaska |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of the mouth of the Martin River in Alaska |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Alaska |
| Subdivision Type4: | Borough |
| Subdivision Name4: | Kenai Peninsula |
| Length: | 7miles[1] |
| Source1: | Kenai Mountains, Kenai National Wildlife Refuge |
| Source1 Location: | Portlock Glacier |
| Source1 Coordinates: | 59.6744°N -150.9672°W |
| Source1 Elevation: | 1810feet[2] |
| Mouth: | Kachemak Bay |
| Mouth Location: | 20miles northeast of Homer |
| Mouth Coordinates: | 59.7628°N -151.0047°W[3] |
| Mouth Elevation: | 0feet |
The Martin River is a stream on the Kenai Peninsula in the U.S. state of Alaska.[3] Beginning at Portlock Glacier in the Kenai Mountains, it flows north for 7miles into Kachemak Bay.[1] The upper river lies within Kenai National Wildlife Refuge.[4] The river mouth is 20miles northeast of Homer.[3]