| Country: | RUS |
| Type: | A |
| Route: | 121 |
| Length Km: | 502 |
| Alternate Name: | Sortavala Highway |
| Direction A: | South |
| Terminus A: | in Saint Petersburg |
| Direction B: | North |
| Terminus B: | near Pryazha |
| Previous Type: | A |
| Previous Route: | 120 |
| Next Type: | A |
| Next Route: | 122 |
The Russian route A121, also known as the Sortavala Highway, is a Russian federal highway from Saint Petersburg to R21 highway in the Republic of Karelia. On the route Saint Petersburg – Sortavala – R21 "Kola" its length is 448 km.[1] In 2017 a 54-km-long road section to Vyartsilya and Finland–Russia border became a part of the A121 highway[2] increasing the total length of the Sortavala Highway to 502 km.