Abstract: An ergonomic armrest primarily for use by dentists or dental hygienists permitting them to rest their arm on an armrest platter and to simultaneously rotate and revolve the platter so that they can perform an operation on a patient's teeth, while continuing to rest their arm. The bottom surface of the armrest platter is pivotally connected to the unsupported end of a cantilevered member, which is pivotally connected at its supported end to a rigid, but height adjustable, vertical support assembly.