Recent　developments　on　supported　Ni-Fe　alloy　catalysts　are　reviewed　for　various　reforming　reactions　such　as　dry　reforming　of　methane　and　steam　reforming　of　molecules　larger　than　methane.　The　catalytic　performance　greatly　depends　on　the　preparation　methods,　because　the　control　of　the　composition　of　the　Ni-Fe　alloy　is　critical.　Simple　co-impregnation　is　not　effective　in　obtaining　uniform　Ni-Fe　alloy　particles.　Impregnation　of　Ni　on　Fe-containing　mixed　oxide　supports　can　give　Ni-Fe　alloy　particles　by　reduction;　however,　the　control　of　the　Fe/Ni　ratio　is　rather　difficult.　On　the　other　hand,　utilization　of　oxide　precursors　containing　both　Ni　and　Fe　ions　such　as　hydrotalcite-like　compounds　and　perovskite　is　effective　in　obtaining　Ni-Fe　alloy　particles　with　controlled　composition.　The　optimized　Ni-Fe　alloy　catalysts　show　good　performance　in　various　reforming　reactions　in　view　of　activity　and　resistance　to　carbon　deposition.　In　addition,　catalysts　prepared　from　oxide　precursors　containing　both　Ni　and　Fe　ions　can　show　good　regeneration　ability　by　re-dispersion　during　the　oxidation-reduction　treatment.　©　2017　The　Royal　Society　of　Chemistry.