Aerobic organisms generate reactive oxygen species (ROS) through respiration, whereas plants produce ROS also during photosynthesis. Although ROS are crucial redox signaling agents, excess production due to external factors (e.g., solar ultraviolet [UV] radiation and radiant heat) can cause cell damage. Therefore, to withstand oxidative environments and maintain homeostasis within the body, organisms are equipped with enzymatic antioxidant mechanisms that control ROS concentrations. Nevertheless, strong external oxidative stress can overwhelm the capacity of enzymatic antioxidant protection systems. Plants synthesize carotenoids, which are well-known scavengers of ROS, and deploy them to the thylakoid membranes of chloroplasts, where they function as a non-enzymatic antioxidant protection system. Animals, lacking the ability to synthesize carotenoids de novo, rely on protective compounds produced by plants. Recent studies have revealed significant negative effects of solar UV-B radiation and radiant heat on plant-dwelling mites, highlighting the direct impact of antioxidant protection on their dynamics and interactions. However, the specific roles and effects of each protection mechanism are unclear. This review discusses the protective mechanisms used by spider mites and phytoseiid mites against oxidative stress induced by heat and UV-B irradiation, focusing on antioxidant enzymes and carotenoids.