Abahai may refer to:

• Western literature's mistaken name for Hong Taiji, Qing Emperor, 20 October 1626 – 15 May 1636
• Lady Abahai Manchu Grand Consort, and posthumously Empress 1590–1626

• 437th Bombardment Squadron
• 437th Fighter-Interceptor Squadron
• 437th Fighter Squadron
• 437th Military Airlift Wing
• 437th Operations Group
• 437th Troop Carrier Group
• 437th Troop Carrier Wing
• 43806 Augustepiccard
• 4380 Geyer
• 4381
• 4381 Uenohara
• 4382 Stravinsky
• 4383 Suruga
• 43841 Marcustacitus
• (4384) Henrybuhl
• 43859 Naoyayano
• 4385 Elsasser
• 4385 Elsässer
• 4386 Lust
• 4386 Lüst
• 4387 Tanaka
• 43881 Cerreto
• 43882 Maurivicoli
• 43889 Osawatakaomi
• 4388 Jürgenstock