The Netherlands under-21 international made 32 appearances for Watford last season.
"For a player of his age he already has great experience in the Premier League and we believe he will bring a lot to our squad," Bournemouth Chief Executive Neill Blake said in a statement.
"He is an international player with great pedigree, so we are really excited to have him join us for the upcoming season."
(Reporting by Shravanth Vijayakumar in Bengaluru; editing by Sudipto Ganguly)
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