A dual-axis hinge assembly including a first rotating shaft, a second rotating shaft, torque components, a rotating shaft sleeve, a first bracket, a second bracket, and two bracket sleeves is provided. The second rotating shaft is disposed side-by-side to the first rotating shaft. The torque components are disposed at the first rotating shaft and the second rotating shaft. The rotating shaft sleeve covers the first rotating shaft, the second rotating shaft, and the torque components. The first bracket is connected to the first rotating shaft. The second bracket is connected to the second rotating shaft. The two bracket sleeves are respectively coaxial with the first rotating shaft and the second rotating shaft and respectively cover the first bracket and the second bracket. The two bracket sleeves and the rotating shaft sleeve are sleeved together. The invention further provides a plurality of electronic devices.