Dirk Jan Klaas Huntelaar (born 12 August 1983), known professionally as Klaas-Jan Huntelaar (Dutch pronunciation: [ˌklaːˈɕjɑn ˈɦʏntəlaːr] ^ⓘ), is a Dutch former professional footballer who played as a striker.

Huntelaar played for PSV, De Graafschap, AGOVV Apeldoorn, Heerenveen, Ajax, Real Madrid and AC Milan, before joining Schalke 04 in August 2010, for whom he was the top goalscorer in the 2011–12 Bundesliga with 29 league goals. Huntelaar is also Schalke's second highest goalscorer of all time, behind Klaus Fischer.

Huntelaar was named Dutch Football Talent of the Year and Ajax "Player of the Year" in 2006, and was a part of the Dutch side that won the 2006 UEFA U-21 Championship where he became the tournament's leading goalscorer and received the player of the tournament award. He was also named as one of two strikers in the UEFA Team of the Tournament. He is the all-time top scorer of the Netherlands U-21 national team with 18 goals in 23 appearances.

Huntelaar was born in Voor-Drempt, a village in the Achterhoek region of Netherlands, but moved to Hummelo when he was six weeks old. He lived with parents Dirk-Jan and Maud Huntelaar, and his two brothers Niek and Jelle. At the age of five, Huntelaar, along with his two brothers, joined the local football team VV H. en K., where he played for the next six years. He was scouted as a youth talent during this period by Go Ahead Eagles but the distance required to travel to the team's base in Deventer prevented him from joining the club.

Soon after, he was scouted by De Graafschap and on 6 April 1994 he signed his first youth contract, aged 10. During his first two years with De Graafschap, Huntelaar played in various positions including left wing, attacking midfield, left back, and even goalkeeper; only in his third year was he deployed as a striker.

In the 1997–98 season, the 14-year-old Huntelaar was the main striker for the C-team at De Graafschap and scored 33 goals in 20 matches. The following season saw him promoted to the B1 team, and in the 1999–2000 season he became top scorer of the B1 league with 31 goals. His goalscoring abilities drew the attention of PSV Eindhoven, who subsequently signed him in June 2000.

In his first season at PSV, Huntelaar quickly established himself as a prolific goalscorer for their A1 youth teams under coach Willy van der Kuijlen, scoring 26 goals in 23 games to become top scorer in the youth league. In his second season at PSV, Huntelaar was added to the senior squad under coach Guus Hiddink. He made his first team debut on 23 November 2002 in a 0–3 away win over Roosendaal, coming on as a second-half substitute for Mateja Kežman in the 76th minute. However, this turned out to be his only appearance for PSV.

By the start of 2003, it was clear that Huntelaar's path into the first team was blocked, therefore he was sent out on loan to his previous club De Graafschap, where his uncle was financial director. He made his senior debut for De Graafschap on 8 February 2003, coming on as a substitute for Hans van de Haar against Roosendaal. He made his only appearance in the starting lineup on 16 February 2003 as De Graafschap were beaten 1–5 by his future club Heerenveen. He then made his final appearance in the team on 29 May 2003 as De Graafschap lost 2–1 to FC Zwolle, confirming their demotion from the Eredivisie. In total, Huntelaar made nine Eredivisie appearances for De Graafschap, one as a starter and eight as a substitute, but was unable to score and De Graafschap decided not to extend his loan.