Route 505 is a 45-kilometre (28 mi) long north–south secondary highway in the northwest portion of New Brunswick, Canada.

The road begins as Centennial Avenue East and travels north-east in the village of Five Rivers.

The road runs parallel to the south bank of the Richibucto River as it travels north-east crossing Beeties Creek.

The road passes Petit-Chockpish and Caissie-Village, and it crosses the Chockpish River near the merge with Route 475.

It turns southeast where it ends in the community of Sainte-Anne-de-Kent at Route 134.