1st Mounted Brigade may refer to:

• 1st (1st South Midland) Mounted Brigade, designation given to the 1st South Midland Mounted Brigade while serving with the 2nd Mounted Division in the Gallipoli Campaign
• 1st Mounted Brigade (United Kingdom), also known as 2/1st Highland Mounted Brigade
• 1st Mounted Brigade (Canada)

• Abdessalem Ayouni
• Abdessamed Bounoua
• Abdesslam Ayouni
• Abdesslem Dekkiche
• Abdi Aadan Haad (abdi Qays )
• Abdi Aadan Haad (Abdi Qays)
• Abdias Nascimento
• Abdiaziz
• Abdi Banda
• Abdication of Akihito
• Abdication of Dom Pedro I
• Abdication of Edward
• Abdication of Edward II
• Abdication of Emperor Akihito
• Abdication of Fontainebleau
• Abdication of James II
• Abdication of James II of England
• Abdication of King Edward
• Abdication of King Edward II
• Abdication of King Edward VIII
• Abdication of King James II
• Abdication of King James II of England
• Abdication of King Richard II
• Abdication of Napoleon in 1815
• Abdication of Richard II