HBA or hba may refer to:
Organizations Hawaii Baptist Academy, United States, a private Christian school Healthcare Businesswomen's Association, promotes involvement of women in healthcare Hewa Bora Airways, defunct airline of DR Congo Hospital Broadcasting Association, supports hospital radio in the United Kingdom Home Builders Association, a local association federated in National Association of Home Builders, a trade association in the United States
Science and technology Hemoglobin A (HbA) Host bus adapter, computer network hardware Horse blood agar, an agar plate Human Biology Association
Other uses Hamba language (ISO 639-3 code hba) Highway Beautification Act Hobart Airport (IATA code), Tasmania, Australia Honours degrees in Canada: Honors Bachelor of Arts, or Honors Business Administration Hood By Air, fashion brand "HBA" (song)