Many low-valent and electron-rich transition metals effect stoichiometric dehalogenation.  The reaction achieves practical interest in the context of organic synthesis, e.g. Cu-promoted Ullmann coupling.
The reaction is mainly conducted as stoichiometrically.  Some metalloenzymes Vitamin B12 and coenzyme F430 are capable of dehalogenations catalytically.  Of great interest are hydrodehalogenations, especially for chlorinated precursors: