Group B of the 2021 FIFA Arab Cup took place from 30 November 2021 to 6 December 2021.
The group consisted of Tunisia, the United Arab Emirates, Syria and Mauritania.
The top two teams, Tunisia and the United Arab Emirates, advanced to the quarter-finals.
In the quarter-finals: Assistant referees: Mohammadreza Mansouri (Iran) Mohammadreza Abolfazli (Iran) Fourth official: Fernando Hernández Gómez (Mexico) Video assistant referee: Khamis Al-Marri (Qatar) Assistant video assistant referees: Hiroyuki Kimura (Japan) Assistant referees: Zakhele Siwela (South Africa) Jerson dos Santos (Angola) Fourth official: Facundo Tello (Argentina) Video assistant referee: Shaun Evans (Australia) Assistant video assistant referees: Rédouane Jiyed (Morocco) Danilo Manis (Brazil) Éber Aquino (Paraguay) Assistant referees: Martin Soppi (Uruguay) Carlos Barreiro (Uruguay) Fourth official: Alireza Faghani (Iran) Video assistant referee: Juan Soto (Venezuela) Assistant video assistant referees: Leodán González (Uruguay) Christian Gittelmann (Germany) Jair Marrufo (United States) Assistant referees: Micheal Barwegen (Canada) Karen Diaz Medina (Mexico) Fourth official: Ryuji Sato (Japan) Video assistant referee: Adonai Escobedo (Mexico) Assistant video assistant referees: Éber Aquino (Paraguay) Osamu Nomura (Japan) Kevin Blom (Netherlands) Assistant referees: Danilo Simon (Brazil) Bruno Pires (Brazil) Fourth official: Janny Sikazwe (Zambia) Video assistant referee: Rafael Traci (Brazil) Assistant video assistant referees: Leodán González (Uruguay) Zakhele Siwela (South Africa) Guillermo Cuadra (Spain) Assistant referees: Rafael Foltyn (Germany) Christian Gittelmann (Germany) Fourth official: Matthew Conger (New Zealand) Video assistant referee: Christian Dingert (Germany) Assistant video assistant referees: Tomasz Kwiatkowski (Poland) Jerson dos Santos (Angola) Éber Aquino (Paraguay)