Lord Voldemort created 7 horcruxes in total - his soul was split into 7 pieces (himself plus 6 horcrux objects). The horcruxes were: Tom Riddle's diary, Marvolo Gaunt's ring, Salazar Slytherin's locket, Helga Hufflepuff's cup, Rowena Ravenclaw's diadem, Harry Potter (unintentional), and Nagini the snake.