| Country: | FIN |
| Type: | K |
| Route: | 45 |
| Alternate Name: | Kantatie 45, Stamväg 45 |
| Maint: | the Finnish Transport Agency |
| Map: | Finland national road 45.png |
| Length Km: | 51 |
| Terminus A: | Helsinki |
| Terminus B: | Hyvinkää |
| Cities: | Vantaa |
The Finnish national road 45 (Finnish: Kantatie 45; Swedish: Stamväg 45) is the 2nd class main route between the major cities of Helsinki and Hyvinkää in southern Finland.[1] It runs from Käpylä in Helsinki to the Hyrylä in Tuusula as a motorway called Tuusula Highway (Finnish: Tuusulanväylä, Swedish: Tusbyleden),[2] where it continues to border of the Hyvinkää town and the national road 3 as a smaller road called Hämeentie.
The road passes through the following localities: