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The effects of dietary Lactobacillus(BCRC 16092) and inulin on growth performance, intestinal microflora, mineral utilization, and tissue mineral contents were evaluated in broilers. The experiment was conducted using 1,152 one-day-old broilers randomly distributed to 9 treatments in a factorial arrangement (3 × 3) using 3 levels of inulin (0, 1, and 2%) and 3 levels of Lactobacillusaddition (108, 109, and 1010CFU/kg). Broilers (1 D of age; 8 replicates per treatments and 16 broilers per replicate) with an initial body weight of 48.36 ± 0.21g were evaluated for 42 D. A 4-D mineral digestibility trial was conducted during the final week of the experiment. The results showed that Lactobacillussupplementation can increase average daily gain and nutrient digestibility and improve feed/gain in broilers (P< 0.05). Moreover, Lactobacillusand inulin supplementation increased the numbers of Lactobacillusand Bifidobacteria, increased serum concentration of IgG and IgA, and decreased the numbers of Escherichia coliand pH in ileum and cecum. The present study demonstrated Lactobacillusand inulin fed to broilers has a positive effect on gut microbiota, growth and nutrient utilization, immune system, and mineral metabolism.