The mulga snake (Pseudechis australis), is a species of venomous snake found in Australia. It is one of the longest venomous snakes in the world, the largest in Australia and is the second-longest in Australia (surpassed only by the coastal taipan). Its alternative common name is "'king brown snake'", although it is a species in the genus Pseudechis (black snakes) and only distantly related to true brown snakes.