An experiment was conducted at the Department of Animal Husbandry and Dairying, Sam Higginbottom University of Agriculture, Technology & Science, Allahabad, India, during year 2017 on Efficacy of Foeniculum vulgare seeds powder on growth performance in broilers. The experiment was laid out in Randomized Block Design (RBD). There were four treatments like T0, T1, T2 & T3 and 28 chicks in each treatment were distributed. Chicks of each treatment with variable proportions of (T0: (control) basal diet with no supplement, T1: Foeniculum vulgare seeds powder 250 gm+50 kg basal diet, T2: Foeniculum vulgare seeds powder 500 gm+50 kg basal diet and T3: Foeniculum vulgare seeds powder 750 gm+50 kg basal diet). In the view of present investigation, the most effective combined supplements of T₃(Foeniculum vulgare seeds powder 750 gm+50 kg basal diet) has proved best in respect of growth performance like body weight and gain in weight, followed by T2, T1 and T0. These formulations improved growth performance in birds. It was concluded that Foeniculum vulgare seeds powder has positive effectson broilers.