Friction stir welding is a refreshing approach to the joining of metals. Although originally intended for aluminium alloys, reach of FSW has now extended to a variety of materials including steels and polymers. It is a solid state welding process which involves joining similar or dissimilar metals using a rotating tool. Tool geometry and traverse speed and rotating speed of motion of the tool, tool axial force and tilt angle are some of the variables in this process. Many materials like Aluminium alloy 2000, 5000, 6000 and 7000 series have been joined using this technique. Mechanical characterization, similar and dissimilar combinations, micro structural characterization, material flow pattern, Influence of tool pin profiles and modeling for FSW processes are some of the important areas of research. This reviews deals with the work for dissimilar aluminium alloys in the above mentioned areas and concludes by suggesting further scope for research in friction stir welding for dissimilar aluminium alloys