| Country: | HUN |
| Type: | MR |
| Route: | 42 |
| Length Km: | 59 |
| Length Round: | 1 |
| Terminus A: | in Püspökladány |
| Junction: |
|
| Terminus B: | Ártánd border with |
| Counties: | Hajdú-Bihar |
| Cities: | Püspökladány, Berettyóújfalu, Biharkeresztes |
The Main road 42 (hu|42-es főút) is a west–east direction First class main road in Hungary, that connects Püspökladány (the Main road 4 change) with Ártánd (the border of Romania). The road is long.[1] Most of the traffic was taken over by the M4 expressway.
The road, as well as all other main roads in Hungary, is managed and maintained by Magyar Közút, state owned company.