The Dutchman, who can also play in midfield, spent last season on loan at Watford and made 24 Premier League appearances for the Hornets.
“Nathan Ake will spend the 2016-17 season on loan at Bournemouth,” said a statement on the Chelsea website.
“The 21-year-old moves to the south coast having also spent last season in the Premier League at Watford, where his performances at left-back won the club’s young player of the year award and helped them reach the FA Cup semi-final.”
Netherlands Under-21 international Ake signed a new five-year deal at Stamford Bridge last year and has played 12 times for the Chelsea first team.
