Dennis Gentenaar (; born 30 September 1975) is a Dutch former professional footballer who played as a goalkeeper. Besides the Netherlands, he has played in Germany. After retiring, he became a goalkeeping coach.
Gentenaar was born in Nijmegen. Coming from the amateur side ZOW, he made his professional debut for NEC on 26 November 1995 aged 20, at home against PSV Eindhoven which NEC lost 5âÂÂ0. Gentenaar made another appearance later that season, but had to wait until 1998 to make his second appearance in professional football. During that season he played seven matches, still as the second goalkeeper for NEC. From the 2000âÂÂ01 season, things changed for Gentenaar and he became NEC's first goalkeeper. From then on he only missed nine appearances in five seasons; during the last three seasons he did not miss a single match.
He developed into a trustworthy goalkeeper and his performance earned him a transfer to Bundesliga side Borussia Dortmund. A year later he returned to the Eredivisie, to become second goalkeeper behind Maarten Stekelenburg at Ajax, at which time he won the 2007 KNVB Cup, his first career trophy. On 8 June 2009, he left Ajax and signed a two-year contract with VVV-Venlo. In 2012, he signed with Almere City FC for a two-year period. After a year in the First Division he returned to his former club NEC and signed a contract for one year. He ended his professional career in May 2014. After retiring, he played another season with amateur club SV Ouderkerk.
Gentenaar was appointed goalkeeping coach at Israeli Premier League club Maccabi Tel Aviv in January 2021, assisting head coach Patrick van Leeuwen.
He was goalkeeping coach at Ukrainian side Shakhtar Donetsk before being sacked in late 2023 when van Leeuwen departed the club. As of March 2025, Gentenaar was goalkeeping coach at Ukrainian First League club Metalist 1925 Kharkiv.
Gentenaar was born in the Netherlands, and is of Indonesian descent through his father.
Gentenaar has a son named Dayen, who also plays as a goalkeeper.