Aaby or Åby may refer to:
Aaby, Aarhus, a suburb in Denmark Nørre Aaby, a town in Denmark Åby Racetrack in Mölndal, Sweden Åby, Norrköping Municipality, a locality in Östergötland, Sweden Åby, Växjö Municipality, a locality in Småland, Sweden
People with the surname Gunnar Aaby (1895–1966), Danish footballer Peter Aaby (born 1944), Danish scientist
See also Aabye