RiverClan is one of the five major Clans and consider StarClan to be their warrior ancestors. They used to live on the reedy, pebbly plain near a river with very few trees, but now live in a patch of land surrounded by two streams. RiverClan cats are known for their amazing skill at fishing and love for the water. They also love beautiful things and are known to collect rocks, shells, and feathers to decorate their dens. They eat mainly fish, but they also eat water voles, shrews, and mice. They are contented, sleek, well-fed cats with well-groomed fur. They are known to be clever and graceful but are perceived outside their Clan as being stubborn and lazy. Their long fur and glossy coats are an asset while swimming. RiverClan gets by in leaf-bare because according to other Clans, they fatten themselves on fish during greenleaf in preparation for leaf-bare. RiverClan cats dislike adding birds to their fresh-kill pile. Sometimes other Clan cats call them "fish-faces", or "fish-breath". They are quite strong swimmers and move through the water as if they are part of it. Their lightning reflexes help them scoop fish from the bank. RiverClan cats often go well-fed, even during leaf-bare, and their sleek and handsome pelts are often something Twolegs are attracted to. Many Twolegs see this, and often take these cats to live in their homes, although RiverClan keeps quiet about it because many of those cats do not come back.

The founder of RiverClan is Riverstar. He is a a silver-gray tom with rippling stripes and green eyes. The first medicine cat was Dapple Pelt.