Matthew Kay may refer to:

• Matty Kay (born 1989), English footballer
• Matthew Kay (cricketer) (born 1982), English cricketer

• Battle of Arles (425)
• Battle of Arles (435)
• Battle of Arles (471)
• Battle of Armstrong's Mill
• Battle of Arnhem (1813)
• Battle of Arrab
• Battle of Arrowfield Church
• Battle of Asculum (279 BC)
• Battle of A Shau
• Battle of Atenquique
• Battle of Atollon
• Battle of Attock, 1758
• Battle of Augusta Traiana
• Battle of Authion
• Battle of Autossee
• Battle of Avdiivka
• Battle of Avignon
• Battle of Ayn al-Warda
• Battle of Azukizaka (disambiguation)
• Battle of Ašmena
• Battle of Bab El Bekkouche
• Battle of Babylon
• Battle of Babylon (634)
• Battle of Babylon (636)
• Battle of Backbone Mountain