In the broader engineering world, nowadays metal matrix composites are having increased applications in almost all domains ranging from industrial requirements, structural components, research materials, improving aesthetic values and more recently domestic appliances. They are preferred over metal alloys, which happened to be the primary choice of consumers, some years ago. Their properties like low cost, high power to weight ratio, improved tensile strength, high hardness and rigidity, good resistance to corrosion and wear make them attractive and most sought after in the fields, they are being used. Particularly, Aluminium matrix composites (AMCs) are having the capability to replace traditionally used metals and their alloys like iron, brass, bronze, copper and steel due to its reduced weight and improved properties. In modern days, welding two alloys or composites (same or different) together has gathered momentum, due to its adaptability and flexibility to be used in any adverse environmental conditions. Joining two dissimilar grades of aluminium matrix composites with different reinforcements is considered to be a challenging one because of the varying physical and chemical properties of the matrix material. Friction stir welding is considered to be most suitable method to join two aluminium alloys or their composites. This review paper deals with an objective to provide deeper insight about the analysis of various process parameters involved in joining two dissimilar grades of aluminium matrix composites with different reinforcements using friction stir welding process.