Hajos could be:

• Tge Hajos–Parrish–Eder–Sauer–Wiechert reaction in organic chemistry
• Zoltan Hajos, a Hungarian born American organic chemist
• Hajós, a town in Bács-Kiskun county, Hungary

• Battle of Martinique (1809)
• Battle of Martinique (disambiguation)
• Battle of Marton
• Battle of martqopi
• Battle of Martín García (1814)
• Battle of Marv
• Battle of maryang san
• Battle of Maryang San
• Battle of Maryan San
• Battle of Masada-Sha'ar HaGolan
• Battle of Masan
• Battle of Mas a Tierra
• Battle of maserfield
• Battle of masoller
• Battle of Matamondo
• Battle of matapan
• Battle of mataquito
• Battle of Mataquito
• Battle of matewan
• Battle of Matrand
• Battle of matrand
• Battle of Matz
• Battle of mauchline muir
• Battle of Mauchline Muir
• Battle of mauron