A/B C/D E/F G/H I/J/K L M N/O/P Q/R/S T/U V/W/Y
| NAME | COUNTY | LOCATION |
| Qanqan Falls | Whatcom | Swift Creek Trail |
| Quartz Canyon Falls | Whatcom | Ross Lake Area |
| Racehorse Falls | Whatcom | Mosquito Lake Road |
| Rachor Falls | King | Snoqualmie Tree Farm |
| Rainbow Falls | East Side | Stehekin Area |
| Rainbow Falls | Whatcom | Baker Lake Road |
| Rainbow Glacier Falls | Whatcom | Ptarmigan Ridge Trail |
| Rainy Lake Falls | Chelan | Washington Pass Area |
| Rat Trap Falls | Snohomish | Suiattle River Road |
| Red Rock Falls | Snohomish | Bedal Area |
| Reveille Falls | Whatcom | Lake Whatcom |
| Rhode Creek Falls | Whatcom | Ross Lake Area |
| Rock Gnome Falls | Whatcom | Heliotrope Ridge Trail |
| Rocky Creek Cascades | Skagit | Day Creek Area |
| Roosevelt Falls | Whatcom | Glacier Creek Road |
| Rosario Falls | San Juan | Orcas Island |
| Round Mountain Falls | Skagit | Segelsen Road |
| Rucker Falls | Snohomish | Silverton Area |
| Rustic Falls | San Juan | Orcas Island |
| Rusty Falls | Skagit | Jackman Creek Road |
| Ruth Creek Falls | Whatcom | Hannigan Pass Road |
| Ryan Falls | Snohomish | Arlington Area |
| Samantha Falls | Whatcom | Baker Lake Road |
| Sandy Creek Falls | Whatcom | Baker Lake Road |
| San Juan Falls | Snohomish | Index-Galena Road |
| Sattler Falls | Whatcom | Ross Lake Area |
| Scenic Falls | King | Stevens Pass Area |
| Schweitzer Falls | Snohomish | Verlot Area |
| Segelsen Ridge Falls | Skagit | Segelsen Road |
| Shelf Lake Falls | Skagit | Segelsen Road |
| Shoestring Falls | King | Foss River Area |
| Sholes Creek Falls | Whatcom | Wells Creek Road |
| Sholes Glacier Falls | Whatcom | Wells Creek Area |
| Silver Falls | Whatcom | Lake Samish Area |
| Sisters Glacier Falls | Whatcom | Middle Fork Nooksack |
| Skaleek Falls | Whatcom | Baker Lake Road |
| Skyline Falls | Whatcom | Glacier Creek Road |
| SMC Falls | King | Snoqualmie Tree Farm |
| Smith Creek Falls | Whatcom | Heliotrope Ridge Trail |
| Snawes Falls | Whatcom | Baker Lake Road |
| Snoqualmie Falls | King | Snoqualmie Falls Area |
| Snow Gulch Falls | Snohomish | Darrington Area |
| Soldier Boy Falls | Skagit | Cascade River Road |
| South Squak Glacier Falls | Whatcom | Scott Paul Trail |
| Squak Glacier Falls | Whatcom | Scott Paul Trail |
| Staircase Falls | King | Snoqualmie Pass Area |
| Standard Falls | Whatcom | Van Zandt Area |
| Stettatle Creek Falls | Whatcom | Stettatle Creek Trail |
| St. Louis Falls | Snohomish | Deer Creek Road |
| Strandberg Falls | Whatcom | Ross Lake Trail |
| Suiattle Falls | Skagit | Suiattle River Road |
| Sulphur Creek Falls | Whatcom | Baker Lake Road |
| Sunset Falls | Snohomish | Index Area |
| Swamp Creek Falls | Whatcom | Twin Lakes Road |
| Swayel Falls | Whatcom | Newhalem Area |
| Sygitowicz Falls | Whatcom | Van Zandt Area |