| Province: | MB |
| Type: | PR |
| Route: | 423 |
| Established: | 1966 |
| Length Km: | 19.7 |
| Direction A: | West |
| Terminus A: | in Crystal City |
| Direction B: | East |
| Terminus B: | near Snowflake |
| Rural Municipalities: | Louise |
| Previous Type: | PR |
| Previous Route: | 422 |
| Next Type: | PR |
| Next Route: | 424 |
Provincial Road 423 (PR 423) is a 19.7adj=midNaNadj=mid east–west highway in the Pembina Valley Region of Manitoba. Essentially an eastern continuation of PTH 3A, it connects Crystal City with La Rivière and Snowflake via Purves. It is located entirely within the Municipality of Louise.
PR 423 begins along the southern outskirts of Crystal City at a junction with PTH 3 / PTH 34 (Boundary Commission Trail), with the road continuing west towards Clearwater as PTH 3A. It heads due east as a two-lane gravel road, travelling through rural farmland as it passes just to the north of Purves, connected via a short section of Road 57W and Railway Street. The highway comes to an end a short time later at an intersection with PR 242 along the boundary with the Municipality of Pembina, roughly halfway between Snowflake and La Rivière.[1]