The increasing concerns over the environmental and health hazards associated with synthetic pesticides have driven the search for sustainable and eco-friendly alternatives. Higher plants are a great reservoir of various phytochemicals and secondary metabolites. Essential oils (EOs), derived from aromatic plants, have gained significant attention as an eco-friendly substitute for prevalent synthetic pesticides. Their diverse bioactive constituents, including terpenoids, phenolics, and other alkaloids, exhibit potent insecticidal, antifungal, bactericidal, and herbicidal properties. Advanced extraction methods, including supercritical fluid extraction and nanoencapsulation, are used in modern botanical pesticide development processes to improve stability, controlled release, and efficacy. Nanoformulation strategies, including nanoencapsulation, nanoliposomes, and polymeric nanoparticles, offer controlled release, enhanced bioavailability, and increased persistence in the field. Additionally, synergistic combinations with biopolymers, surfactants, and other botanical compounds further optimize the bioactivity, improve bioavailability, reduce environmental persistence, and minimize resistance development in target pests. Research advancements in nanotechnology and other omics technologies are further optimizing EO-based pesticides for targeted pest control with minimal nontarget effects. These developments establish EOs as viable options for sustainable agriculture, providing a safe and efficient substitute for conventional chemical pesticides.