<p>This study evaluated the functional response and life table parameters of the predator <i>Orius vicinus</i> (Ribaut) (Hemiptera: Anthocoridae) when fed on immature stages of the polyphagous pest <i>Bemisia tabaci</i> (Genn.) (Hemiptera: Aleyrodidae). Biological and life table parameters, including development, survival, reproduction, and population growth rates, were assessed using two-sex age–stage life table analysis. Functional responses of adult <i>O. vicinus</i> to the egg, larval, and pupal stages of <i>B. tabaci</i> were determined separately under controlled conditions of 26 ± 1&#xa0;°C, 60 ± 10% relative humidity (RH), and a 16:8&#xa0;h light: dark (L: D) photoperiod. Results showed that egg development lasted 4.67 ± 0.06 days, total nymphal development was 13.65 ± 0.13 days with a survival rate of 77.32%, and mean fecundity per female was 60.89 ± 2.76 eggs. Female and male adult longevities were 16.95 ± 0.55 and 12.27 ± 0.54 days, respectively. Adult preoviposition period (APOP) and total preoviposition period (TPOP) were 4.14 ± 0.12 and 22.7 ± 0.23 days, respectively, while the oviposition period lasted 11.23 ± 0.53daysThe estimated life table parameters were the intrinsic rate of increase (<i>r</i>) of 0.113&#xa0;day⁻¹, the net reproductive rate (<i>R</i>₀) of 24.8 offspring, the finite rate of increase (<i>λ</i>) of 1.12&#xa0;day⁻¹, and the mean generation time (<i>T</i>) of 28.4 days. Functional response analysis revealed a Type III response to eggs and larval stages, and a Type II response to pupae. These results indicate that <i>O. vicinus</i> could be effectively integrated into Biological control programs against <i>B. tabaci</i>.</p>