Lord Voldemort created seven Horcruxes in total. He intended to split his soul into seven parts because seven is a powerful magical number. This meant six Horcruxes plus the piece of soul remaining in his own body
. The seven Horcruxes are:
- Tom Riddle's diary
- Marvolo Gaunt's ring
- Salazar Slytherin's locket
- Helga Hufflepuff's cup
- Rowena Ravenclaw's diadem
- Nagini, the snake
- Harry Potter (an accidental Horcrux created when Voldemort's soul unintentionally latched onto him during the failed killing curse)
So, while Voldemort intended to create six Horcruxes, Harry became the seventh piece of soul outside Voldemort's body, making a total of seven Horcruxes plus the soul fragment in Voldemort himself, which means Voldemort's soul was split into eight parts in total, but only seven Horcruxes were deliberately created
. In summary: There are seven Horcruxes, including Harry Potter as an accidental one.