The present contribution reports on the study of diversity and population dynamics of reduviids in selected habitats in Virudhunagar district, Tamil Nadu. Data on the diversity and population dynamics of Rhynocoris marginatus (Fab.), Rhynocoris fuscipes (Fab.) and Catamiarus brevipennis (Serville) from the agricultural field. Acanthaspis pedestris (Stål) from the semi-arid zone, Ectrichodia crux (Thunberg) and Lophocephala guerini (Lap.) from the Scrub jungle area were collected in 12 months from January 2020 to December 2020. Various diversity indices like the Margalef index (R1), Menhinick index (R2), Simpson's index (λ), Shannon's index (H`), Evenness indices were calculated, and the results were provided. Predator and prey density levels of Reduviid bugs were observed in the study field. The maximum reduviid population was recorded in August 2020, and the minimum population was followed in November 2020. The Reduviid diversity was correlated with meteorological data. The results of correlation revealed that rainfall, humidity, and temperature affect reduviid population. Present study revealed the unstable condition of reduviid bug population. Hence, measures to be taken to uplift the reduviid population by mass culture and field release.