Mangroves are an ecosystem with a unique function in the living environment. Mangroves are a typical coastal ecosystem determined by tides. Mangrove forests are unique ecosystems because of their tidal cycles. The vegetation consists of mangroves were Rhizopora stylosa, R. mucronata, R apiculata. The data collection techniques used nisbi (relative) methods sampling used three tools (Yellow Sticky Traps /YST, Blue Pan Trap/BPT, Sweep Net/SN) since January until February 2024. The data used in this research are primary data and secondary data obtained directly from the local community. The results showed that the insects caught were 9 orders, 32 families, 42 genera and 1518 individuals. Based on research conducted in the mangrove forest in Beras Basah Village, Pangkalan Susu District recorded 9 species of pests, namely: bagworms (Acanthopsyche sp), pagoda bagworm (Pagodiella sp.), termite pests (Prorhinotermes sp.), krama/tree climbing crab (Episesarma sp), nacerdes bettles (Xanthochroa sp), aphid (Prociphilus tessellatus), cobwebs, barnacles (Balanus amphitrite), leatherleaf slug (Vaginula bleekeri). The abiotic factors that influences are the temperature and humidity in the mangrove.