Asian Highway 18 is a highway route included in Asian Highway Network, running from Hat Yai in Thailand to Johor Bahru, Malaysia. Route AH18 runs along main eastern coastal road in southern Thailand and also along Federal Route 3 of Malaysia.

Asian Highway 18 connects these cities in Thailand: Hat Yai - Pattani - Narathiwat - Tak Bai - Su-ngai Kolok

Asian Highway 18 connects these cities in Malaysia: Rantau Panjang - Pasir Mas - Kota Bharu - Pasir Puteh - Kuala Terengganu - Marang - Kuala Dungun - Paka - Chukai - Balok - Kuantan - Pekan - Mersing - Kota Tinggi - Johor Bahru

AH2 Hat Yai

AH2 Johor Bahru