De viktigere sideelver som renner ut i Fraser Rivver er Brunette River, Coquitlam River, Pitt River, Stave River, D'Herbomez Creek, Norrish Creek, Sumas River, Harrison River, Ruby Creek, Coquihalla River, Anderson River, Nahatlatch River, Thompson River, Stein River, Seton River, Bridge River, Churn Creek, Chilcotin River, Williams Lake River, Quesnel River, Cottonwood River, West Road River (Blackwater River), Nechako River, Salmon River, Willow River, McGregor River, Bowron River, Torpy River, Morkill River, Goat River, Doré River, Holmes River, Castle Creek, Rausch River, Kiwa Creek, Tete Creek, McLennan River, Swiftcurrent Creek, Robson River og Moose River.