Codium muelleri is a species of seaweed in the Codiaceae family.
The firm medium green erect thallus is usually around 25cm (10inches) in height with repeatedly dichotomous branches.
It is found in sublittoral zones to a depth of 12m (39feet) in rough to moderate water coasts.
In Western Australia is found along the coast in the Mid West region extending along the south coast and along as far as the east coast of Victoria.