Dissimilatory　iron　reduction　plays　an　important　role　in　the　biogeochemical　cycling　of　iron,　sulfur,　carbon,　and　other　elements　in　coastal　tidal　wetlands.　This　process　is　impacted　by　the　unique　topography,　hydrology,　and　bioturbation　of　each　coastal　tidal　wetland　area,　causing　it　to　exhibit　considerable　spatial　and　temporal　heterogeneity.　Study　of　dissimilatory　iron　reduction　will　not　only　benefit　understanding　of　organic　matter　degradation,　but　may　also　provide　an　important　theoretical　foundation　for　the　future　evaluation　of　green-house　gas　emissions.　The　review　lists　the　contributions　of　iron　reduction　to　anaerobic　organic　matter　oxidation　obtained　from　the　coastal　tidal　wetlands　all　over　the　world.　The　present　review　also　introduces　the　mechanism　and　control　factors　of　iron　reduction　including　organic　matter　substrates,　iron-reducing　microorganisms,　and　other　competitive　electron　acceptors　(e.g.,　sulfate).　Future　research　in　this　field　is　addressed　at　the　end　of　this　review.　The　purpose　of　this　review　is　to　draw　more　attention　to　iron　reduction　and　hopefully　offer　useful　references　for　biogeochemists.