The　mutual　diffusion　coefficients　of　isopropanol　+　n-heptane　and　isobutanol　+　n-heptane　were　measured　at　different　concentrations　and　in　the　temperature　range　from　(283.15　to　323.15)　K.　The　measurements　were　carried　out　using　a　digital　holographic　interferometry　system.　For　all　the　mixtures　investigated,　the　mutual　diffusion　coefficient　increases　as　the　temperature　increases.　At　the　same　concentration　and　temperature,　the　mutual　diffusion　coefficients　of　isobutanol　+　n-heptane　were　lower　than　those　of　isopropanol　+　n-heptane　due　to　the　fact　that　the　molecular　weight　of　isobutanol　is　larger　than　that　of　isopropanol.　A　new　correlation　is　proposed　for　the　mutual　diffusion　coefficients　of　isopropanol　+　n-heptane　and　isobutanol　+　n-heptane.　The　absolute　average　relative　deviation　between　the　correlation　and　experiment　is　less　than　1.90%.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.