Microbial volatile organic compounds (mVOCs) play a crucial role in plant defense mechanisms by promoting growth, activating defense pathways, and directly inhibiting phytopathogens. These compounds, emitted by microorganisms across different kingdoms, help plants resist biotic stressors such as fungi, bacteria, and insects. mVOCs can activate systemic acquired resistance (SAR) and induced systemic resistance (ISR) pathways, enhancing plant resilience. They also contribute to indirect protection by modulating plant physiology and gene expression. In agriculture, the overuse of chemical fertilizers and pesticides has led to environmental pollution and food safety issues, prompting the search for sustainable alternatives. mVOCs offer a promising solution by providing natural defense mechanisms without harmful environmental impacts. Bacterial VOCs (bVOCs) are particularly effective in activating plant defense responses, often through the induction of defense-related genes and the modulation of phytohormones like salicylic acid (SA) and jasmonic acid (JA). Fungal VOCs (fVOCs) also play a significant role in protecting plants against phytopathogens, with species like Trichoderma and Muscodor producing compounds that inhibit fungal growth and enhance plant resistance. Yeast VOCs (yVOCs) have been shown to protect plants against fungal infections and improve their resistance to pathogens. Microalgae VOCs (maVOCs) contribute to plant growth and defense by activating defense pathways and inducing gene expression. Oomycetes, while typically phytopathogenic, can also produce VOCs that inhibit pathogen growth and promote plant health. The application of VOCs from various microbial sources offers a sustainable approach to plant protection, reducing reliance on chemical pesticides and fertilizers. Further research is needed to fully understand the mechanisms of VOC action and to develop effective microbial consortia for agricultural use. This review highlights the potential of VOCs in enhancing plant defense and promoting sustainable agriculture.Microbial volatile organic compounds (mVOCs) play a crucial role in plant defense mechanisms by promoting growth, activating defense pathways, and directly inhibiting phytopathogens. These compounds, emitted by microorganisms across different kingdoms, help plants resist biotic stressors such as fungi, bacteria, and insects. mVOCs can activate systemic acquired resistance (SAR) and induced systemic resistance (ISR) pathways, enhancing plant resilience. They also contribute to indirect protection by modulating plant physiology and gene expression. In agriculture, the overuse of chemical fertilizers and pesticides has led to environmental pollution and food safety issues, prompting the search for sustainable alternatives. mVOCs offer a promising solution by providing natural defense mechanisms without harmful environmental impacts. Bacterial VOCs (bVOCs) are particularly effective in activating plant defense responses, often through the induction of defense-related genes and the modulation of phytohormones like salicylic acid (SA) and jasmonic acid (JA). Fungal VOCs (fVOCs) also play a significant role in protecting plants against phytopathogens, with species like Trichoderma and Muscodor producing compounds that inhibit fungal growth and enhance plant resistance. Yeast VOCs (yVOCs) have been shown to protect plants against fungal infections and improve their resistance to pathogens. Microalgae VOCs (maVOCs) contribute to plant growth and defense by activating defense pathways and inducing gene expression. Oomycetes, while typically phytopathogenic, can also produce VOCs that inhibit pathogen growth and promote plant health. The application of VOCs from various microbial sources offers a sustainable approach to plant protection, reducing reliance on chemical pesticides and fertilizers. Further research is needed to fully understand the mechanisms of VOC action and to develop effective microbial consortia for agricultural use. This review highlights the potential of VOCs in enhancing plant defense and promoting sustainable agriculture.