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The mechanical properties and microstructure of AA6063 alloy reinforced with palm kernel shell (PKS) powder were studied. AA6063 matrix composites reinforced with varying weight fractions of palm kernel shell particles (ranging from 2.5% to 15% at 2.5 intervals) were prepared using the stir compocasting technique. The mechanical properties and microstructure of the developed composites were analysed and compared with the matrix alloy. The experimental results showed that palm kernel shell reinforcement influenced the structure of AA6063 alloy through grain refinement as it remained homogeneously dispersed within the matrix, and the mechanical properties of the composites were improved. The mechanical stirring action employed during composite fabrication was an effective factor that influenced the enhancement of the mechanical properties of AA6063-PKS matrix composites. AA6063-PKS …