| Little Chilliwack River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Washington |
| Subdivision Type3: | County |
| Subdivision Name3: | Whatcom County |
| Source1: | Ridge between it and Silesia Creek |
| Source1 Location: | North Cascades |
| Mouth: | Chilliwack River |
| Mouth Location: | Just south of the inlet of Chilliwack Lake |
The Little Chilliwack River is a small river in Whatcom County, Washington. It is a tributary of the Chilliwack River, entering the river just below the Canada–United States border.
The river originates at a ridge between it and Silesia Creek. It flows just over 7 miles northeast from there to its confluence with the Chilliwack on the opposite side of the river from a trail leading up the Chilliwack. The Little Fork merges with it just under 2 km above its mouth.
The Little Fork Little Chilliwack River starts at the base of Copper Mountain. It flows about 4 ½ km northeast as well, merging with the main fork about 2 km upstream from the river's mouth.