| McLennan River | |
| Pushpin Map: | British Columbia#Canada |
| Pushpin Map Size: | 255px |
| Pushpin Map Caption: | Location of river's mouth in British Columbia |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | British Columbia |
| Subdivision Type3: | District |
| Subdivision Name3: | Cariboo Land District |
| Source1: | McLennan Glacier |
| Source1 Location: | Premier Range |
| Source1 Coordinates: | 52.8222°N -119.5575°W[1] |
| Source1 Elevation: | 2175m (7,136feet) |
| Mouth: | Fraser River |
| Mouth Location: | Tête Jaune Cache, Robson Valley |
| Mouth Coordinates: | 52.9661°N -119.4619°W |
| Mouth Elevation: | 727m (2,385feet)[2] |
| Basin Size: | 534km2[3] |
The McLennan River is a tributary of the Fraser River in the Robson Valley region of British Columbia. The river was named after an engineer on one of the Canadian Pacific Railway surveys in the 1870s.
The McLennan River originates in the Premier Range, flowing from McLennan Glacier between Mount Stanley Baldwin and Mount Arthur Meighen. The river flows east out of the mountains into the Rocky Mountain Trench near Valemount. Then it turns northwest, flowing through the Rocky Mountain Trench, picking up tributary streams flowing from the Selwyn Range to the east and the Premier Range to the west. It joins the Fraser River at Tête Jaune Cache.