Coprosma dumosa is a species of Coprosma, endemic to New Zealand.
A small shrubby leafy bush with small leaves. Glabrous on the underside of the leaf, with short hairs on the branchlets.
Known from both the North Island, South Island, and Stewart Island.
Lowland to montane forests.
The mistletoe Korthalsella clavata uses Coprosma dumosa as a secondary host.
The specific name dumosa means 'bushy' in Latin.
Coprosoma dumosa may be identical to Coprosma tayloriae. It also hybridizes with other Coprosma species.