| Province: | NL |
| Type: | NL |
| Route: | 204 |
| Alternate Name: | Southwest Arm Road |
| Maint: | Newfoundland and Labrador Department of Transportation and Infrastructure |
| Length Km: | 30.5 |
| Direction A: | West |
| Terminus A: | in North West Brook |
| Direction B: | East |
| Terminus B: | Southport |
| Previous Type: | NL |
| Previous Route: | 203 |
| Next Type: | NL |
| Next Route: | 205 |
Route 204, also known as Southwest Arm Road, is a 30.5adj=midNaNadj=mid east–west highway on the island of Newfoundland in the province of Newfoundland and Labrador. It connects the communities along the southern shore of the Southwest Arm of Trinity Bay with the Trans-Canada Highway (Route 1) at North West Brook. It is a very curvy two-lane highway traversing very hilly terrain for its entire length.
Route 204 begins at an intersection with Route 1 (Trans-Canada Highway) in North West Brook and it heads north to pass through downtown and have an intersection with Harbour Drive, which provides access to Ivany's Cove. The highway now curves to the east and begins winding its way along the southern shore of Southwest Arm, with the road passing through the communities of Queen's Cove, Long Beach, Hodge's Cove, Caplin Cove, Little Heart's Ease, and Butter Cove, where it has two intersections with a local road that loops through Gooseberry Cove. Route 204 now makes a sharp left turn and heads northward for a few kilometres before entering Southport and coming to a dead end in a neighbourhood just past the town's harbour.