Recent　advances　in　bio-electrochemical　systems　(BESs)　for　azo　dye　removal　are　gaining　momentum　due　to　having　electrode　biocarrier　and　electro-active　bacteria　that　could　stimulate　decolorization　via　extracellular　electron　transfer.　Enhanced　decolorization　performance　is　observed　in　most　laboratory　studies,　indicating　the　great　potential　of　BESs　as　an　alternative　to　the　traditional　biological　processes　or　serving　as　a　pre-/post-processing　unit　to　improve　the　performance　of　biological　processes.　It　is　proven　more　competitive　in　environmental　friendly　than　physicochemical　methods.　While,　the　successful　application　of　BESs　to　azo　dye-containing　wastewater　remediation　requires　a　deeper　evaluation　of　its　performance,　mechanism　and　typical　attributes,　and　a　comprehensive　potential　evaluation　of　BESs　practical　application　in　terms　of　economic　analysis　and　technical　optimizations.　This　review　is　organized　to　address　BESs　as　a　practical　option　for　azo　dye　removal　by　analyzing　the　decolorization　mechanisms　and　involved　functional　microorganisms,　followed　by　the　comparisons　of　device　configurations,　operational　conditions,　and　economic　evaluation.　It　further　highlights　the　current　hurdles　and　prospects　for　the　abatement　of　azo　dyes　via　BES　related　techniques.