Actinobacteria are gram-positive bacteria that can produce primary metabolites in the form of enzymes, one of which is the chitinase enzyme. Chitinase is an enzyme that has the ability to degrade chitin which is the main structure in the cell wall of plant pathogenic fungi. One of the Actinobacteria that have the ability to produce enzymes can be obtained from the soil of the PTPN VI Muaro Jambi oil palm plantation which can be used as a biocontrol agent for plant pathogenic fungi, namely Ganoderma boninense. The purpose of this study was to determine the magnitude of the activity of the chitinase enzyme Actinobacteria and to determine the magnitude of the inhibitory activity of the enzyme chitinase Actinobacteria against Ganoderma boninens...