A three-dimensional Hall MHD simulation is carried out to study the Hall effects on the generation of field-aligned currents (FAC) and Alfv¿n waves by magnetic reconnection. The magnetic field is initially set up with an antiparallel component (Bz) with respect to the plane x=0. The initial current flows in the y direction. Several interesting features emerge owing to the inclusion of the Hall term in the MHD equation. In Hall MHD, the magnetic field lines are frozen in the electron fluid, but not in the ion fluid. In the presence of a Hall term, a strong electron velocity in the -y direction is usually present in the region with a high current density J in the y direction. As a result, the reconnected magnetic field lines are bent and also shifted in the -y direction. Generated FACs break the dawn-dusk symmetry, and the region of generated FACs tends to shift to the side with y1. ¿ 2001 American Geophysical Union