| Country: | ISL |
| Type: | Primary |
| Route: | 25 |
| Map: | Iceland Route 25.png |
| Length Km: | 18.5 |
| Length Ref: | http://www.vegagerdin.is/vefur2.nsf/Files/Vegaskra_2016/$file/Vegaskr%C3%A1_2016.xlsx |
| Direction A: | Northern |
| Terminus A: | Hella |
Icelandic: Þykkvabæjarvegur (in Icelandic pronounced as /ˈθɪhkvaˌpaiːjarˌvɛːɣʏr̥/) or Route 25 is a national road in the Southern Region of Iceland. It runs from Route 1 near Hella, crosses through Þykkvibær and ends at Suður Nýibær.[1]