The effect of different amount of starch addition on structural and superconducting properties of superconducting MgB 2 has been discussed. The samples are synthesized by conventional solid reaction method. XRD analysis confirms that carbon, which is produced during synthesis due to decomposition of starch, is substituted in the B sites. High resolution transmission electron microscope (HRTEM) picture infers the presence of large number of nanosized precipitates (size ∼10–20nm) in starch doped MgB 2 pellets. Superconducting transition temperature (T c 0 ) of MgB 2 (∼38K) decreases due to the addition of starch. The critical current density (J c ) of starch added MgB 2 samples, however, shows significant improvement in whole field range, especially at high magnetic fields. MgB 2 added with 2wt.% of starch gives the best performance amongst the investigated samples and at 20K displays ∼42 times enhancement in J c under 4T field compared to that for pure MgB 2 . The field dependence of the critical current density (J c ) of starch added MgB 2 is explained fairly well in terms of collective pinning theory. An excellent scaling of the reduced critical current density, Jn(=J c /J c (0)) and the reduced field h n (=H/H 0 ) is observed for both pure and starch added MgB 2 polycrystalline pellets at different temperatures, where J c (0) and H 0 are the fitting parameters obtained from collective pinning model. However, the normalized pinning force density (F P /F p (max) ) of starch added samples does not display any scaling, but shows an excellent correspondence with modified Dew–Hughes expression. The presence of anisotropy and grain orientation is thought to be responsible for the absence of scaling of normalized pinning force density in starch added MgB 2 pellets.