A survey of the biology and natural history of the infraorder Cimicomorpha of Kazakhstan, based on fieldwork throughout the country between 2010 and 2020 and a review of the lead author's personal collection, identified 31 species from 17 genera belonging to 4 families. Of these, 19 species were zoophages, 1 species was a mycetophage, and 11 species were phytophages, divided into 3 subgroups: polyphages, broad and narrow oligophages. The majority, (26 species, 84%), overwintered in the adult stage, three species (10%) wintered as nymphs, and two species (6%) overwintered in the egg stage. Based on habitat moisture requirements, the following groups were identified: mesophiles (27 species), meso-xerophiles (1 species), xerophiles (1 species), hygro-mesophiles (1 species) and hygrophiles (1 species). Habitat structure requirements also divided the surveyed species into 9 groups: dendrobionts, tamno-dendrobionts, dendro-chortobionts, chorto-tamnobionts, chortobionts, herpetobionts, herpeto-chortobionts, epigeobionts and eurychortobionts. The species belonged to 12 zoogeographical regions: Holarctic (1), Trans-Palearctic (3), West Palearctic (3), Trans-Eurasian (10), West Eurasian (6), European-Kazakh (1), Iranian-Turanian (2), Turanian (1), Mid-eastern Tethyan (1), Turkestan (1), North Turkestan (1).