Forced convection in unsteady magnetohydrodynamic boundary layer flow of nanofluid over a permeable shrinking sheet in the presence of viscous dissipation and convective boundary condition is studied. The nanofluid model includes Brownian motion and thermophoresis effects. Similarity transformations are employed to transform the governing partial differential equations into ordinary differential equations. The transformed equations are then solved numerically by Bvp4cMatlab solver. The flow features and heat and mass transfer characteristics for different values of the governing parameters viz. thermophorosis parameter, Brownian motion parameter, Prandtl number, unsteadiness parameter, wall mass suction parameter, Biot number, Lewis number and Eckert numberare analyzed and discussed in detail.