| Country: | LKA |
| Type: | A |
| Route: | 4 |
| Length Km: | 430 |
| Direction A: | North |
| Terminus A: | Colombo A1 |
| Direction B: | West |
| Terminus B: | Batticaloa A15 |
| Previous Type: | A |
| Previous Route: | 1 |
| Next Type: | A |
| Next Route: | 15 |
The A4 Highway also known as the Colombo-Ratnapura-Wellawaya-Batticaloa highway, is the longest highway in Sri Lanka, at [1] in length. It goes Colombo to Batticaloa, through many important cities in Western, Sabaragamuwa, Uva and Eastern provinces.
The highway passes through Kirulapone, Nugegoda, Delkanda, Navinna, Maharagama, Pannipitiya, Kottawa, Homagama, Godagama, Meegoda, Meepe, Pahathgama, Hanwella, Avissawella, Eheliyagoda, Kuruwita, Ratnapura, Lellopitiya, Pelmadulla, Balangoda, Beragala, Koslanda, Wellawaya, Buttala, Monaragala, Liyangolla, Siyambalanduwa, Hulanuge, Lahugala, Pottuvil, Komari, Thirukovil, Akkaraipattu, Oluvil, Karaitivu, Kalmunai, Periyakallar, Chettipalayam, Arayampathy, and Kattankudy.
Bus Routes
The stretch from Colombo up to Hanwella is known as the High Level Road.