Abstract: An adjustable rotation limiter for a monitor arm is disclosed. The monitor arm may include a base portion and a rotatable arm portion. The rotation limit system includes a rotation limit selector that is carried on either the base portion or the rotatable arm portion and includes a limit projection that extends parallel to an axis of rotation. A rotation limit bushing is carried on the other of the base portion or rotatable arm portion and includes an annular recess having a slot extending in a circular arc about the axis of rotation. The limit projection is slidably inserted into the slot to limit the extent of rotation of the rotatable arm portion with respect to the base portion.