A fixing support includes first, second and third fixing units and limiting elements. The first fixing unit has a first slide groove extending in first direction. The second fixing unit includes a second-direction fixing portion and a second-direction sliding portion. The second-direction fixing portion has a second slide groove extending in second direction. The second-direction sliding portion is slidably disposed at the second slide groove. The third fixing unit includes a third-direction fixing portion and a third-direction sliding portion. The third-direction fixing portion has a third slide groove extending in third direction. The third-direction sliding portion is slidably disposed at the third slide groove. The limiting elements allow the first, second and third fixing units to slidably connect to each other and allow the first, second and third directions to be linearly independent of each other. An electronic device is further introduced.