BA or Ba may stand for:

• ba
  • an archaic two-letter English word meaning "to kiss".
  • in Egyptian mythology:
    1. One part of the Egyptian soul (which was imagined as a bird body with a human head).
    2. A ram-god of fertility, worshipped especially in Mendes. Women desiring a pregnancy prayed to him for help.
• Bachelor of Arts, see Bachelor's degree
• barium (Ba), the chemical symbol for the chemical element
• Bashkir language (ISO 639 alpha-2, ba)
• Boeing Company (stock symbol)
• Bosnia and Herzegovina (ISO country code)
• Boston and Albany Railroad
• British Airways
• The British Association for the Advancement of Science
• Buenos Aires