Group B was one of the two groups of the 2018 AFF Championship.
It consisted of Thailand, Indonesia, the Philippines, Singapore and qualification round winners Timor-Leste.
The matches were played from 9 to 25 November 2018.
In the semi-finals: Man of the Match: Hariss Harun (Singapore) Assistant referees:[4] Nguyễn Trung Hậu (Vietnam) Phạm Mạnh Long (Vietnam) Fourth official:[4] Xaypaseuth Phongsanit (Laos) Man of the Match: Adisak Kraisorn (Thailand) Assistant referees:[8] Zairul Khalil (Malaysia) Arif Shamil (Malaysia) Fourth official:[8] Souei Vongkham (Laos) Man of the Match: Andik Vermansyah (Indonesia) Assistant referees:[12] Somphavanh Louanglath (Laos) Kilar Ladsavong (Laos) Fourth official:[12] Amdillah Zainuddin (Brunei) Man of the Match: Patrick Reichelt (Philippines) Assistant referees:[16] Azman Ismail (Malaysia) Zayar Maung (Myanmar) Fourth official:[16] Thant Zin Oo (Myanmar) Man of the Match: Carli de Murga (Philippines) Assistant referees:[20] Pisal Kimsy (Cambodia) Ali Faisal Rosli (Brunei) Fourth official:[20] Khoun Virak (Cambodia) Man of the Match: Sanrawat Dechmitr (Thailand) Assistant referees:[24] Somphavanh Louanglath (Laos) Win Thiha (Myanmar) Fourth official:[24] Myat Thu (Myanmar) Man of the Match: Jovin Bedic (Philippines) Assistant referees:[28] Trương Đức Chiến (Vietnam) Sopheap Chi (Cambodia) Fourth official:[28] Chy Samdy (Cambodia) Man of the Match: Safuwan Baharudin (Singapore) Assistant referees:[32] Chit Moe Aye (Myanmar) Kilar Ladsavong (Laos) Fourth official:[32] Fitri Maskon (Malaysia) Man of the Match: Supachai Jaided (Thailand) Assistant referees:[36] Trần Liêm Thanh (Vietnam) Trương Đức Chiến (Vietnam) Fourth official:[36] Nguyễn Hiền Triết (Vietnam) Man of the Match: Riko Simanjuntak (Indonesia) Assistant referees:[40] Zhou Fei (China PR) Pisal Kimsy (Cambodia) Fourth official:[40] Nagor Amir Noor Mohamed (Malaysia)