In this paper, we study a minimal Lagrangian submanifold of C n defined by Harvey and Lawson, which we will call the Lagrangian catenoid because we characterize it locally proving that, besides the Lagrangian subspaces, it is the only minimal Lagrangian submanifold foliated by round (n � 1)-spheres of C n . Also we obtain a global characterization of it among the n-dimensional complete minimal submanifolds of C n with finite total scalar curvature.