| Province: | AB |
| Type: | Hwy |
| Route: | 42 |
| Map: | Alberta Highway 42 Map.png |
| Map Notes: | Highway 42 highlighted in red |
| Length Km: | 44.02 |
| Direction A: | West |
| Direction B: | East |
| Terminus A: | in Penhold |
| Junction: | near Penhold |
| Terminus B: | near Lousana |
| Rural Municipalities: | Red Deer County |
| Towns: | Penhold |
| Previous Type: | Hwy |
| Previous Route: | 41 |
| Next Type: | Hwy |
| Next Route: | 43 |
Alberta Provincial Highway No. 42, commonly referred to as Highway 42, is a 44km (27miles) highway in central Alberta, Canada that connects Highway 2A in Penhold, about 9km (06miles) south of the city of Red Deer, to Highway 21 near the Hamlet of Lousana.[1]
From west to east.