Abstract Objective To assess the antifertility activity of ethanolic extract of Caesalpinia pulcherrima Linn ( C. pulcherrima ) leaves in albino female mice. Methods Acute toxicity study of the extract was carried out in adult albino mice. The antifertility activity of the extract at dose levels (200 and 400 mg/kg, orally) was evaluated in two experimental animal models i.e. antiimplantation and esterogenic/antiestrogenic activity in female mice by observing no. of implants, estrus cycle, vaginal cornification, uertus weight and cholesterol content. Results The extract was found to be safe up to a dose of 4 000 mg/kg body weight when administered orally. A good antiimplantation (66.66 %) activity in female mice was observed at the tested dose levels (200 and 400 mg/kg, orally). The extract further showed more significant ( P Conclusions The results suggest that ethanolic extract of C. pulcherrima leaves possess significant antifertility activity, therefore, justifying the traditional use of this plant in fertility regulation.