Jacobus Antonius Peter Johannes "Jasper" Cillessen (born 22 April 1989) is a Dutch professional footballer who plays as a goalkeeper for La Liga club Las Palmas.

Following an injury to first-choice goalkeeper Gábor Babos, Cillessen made his senior debut on 28 August 2010 in a 2–2 home draw against SC Heerenveen and was voted the man of the match.

Even when Babos returned from injury, Cillessen managed to keep his spot in the first team and signed a two-year contract extension that tied him to NEC until 2014.

He made his first league appearance for Ajax in a 2011–12 Eredivisie match on 23 October 2011 against arch-rivals Feyenoord, coming on as a 66th-minute substitute for right back Gregory van der Wiel, after starting goalkeeper Kenneth Vermeer had been shown a red card.

[10] Since his move to Barcelona in 2016, Cillessen managed to play a major role in the Copa del Rey for both the 2016–17 and 2017–18 seasons, starting 17 of 18 matches in the competition.

[13] On 30 January 2019, he saved the first penalty of his professional career after 20 attempts in a 6–1 home win over Sevilla in the Copa del Rey, which enabled Barcelona to advanced to the semi-finals of the competition 6–3 on aggregate.

[14] On 25 June 2019, Cillessen signed a four-year contract with Valencia, for a fee of €35 million, making him the second-most expensive transfer in the history of the club.

On 7 June 2013, Cillessen obtained his first cap for the Netherlands national team under manager Louis van Gaal, after several call-ups in the past.

However, in the quarter-final against Costa Rica, Louis van Gaal unexpectedly substituted him for Tim Krul ahead of the penalty shootout, which the Dutch team won.