Khalid Boulahrouz (born 28 December 1981, in Maassluis, Netherlands) is a Dutch footballer of Berber Moroccan Rif descent, who plays for the Netherlands and Sporting Clube de Portugal. His nickname is "Khalid the Cannibal" for his ability to "eat up" the opposition. He is noted for his tackling and versatility in the back.

RKC
After a difficult period playing for different clubs, he finally found some stability at Waalwijk, where coach Martin Jol gave him the confidence he had been looking for. He began his professional career in the Dutch Eredivisie for RKC on 9 March 2002, against Heerenveen.

Hamburger SV
After playing two seasons for RKC he moved to Hamburg to play in the German Bundesliga at the start of the 2004–05 season. While at Hamburg, he earned his nickname "Khalid der Kannibale" ("Khalid the Cannibal") for his ability to eat up the opposition. This is illustrated by the amount of cards he received – 16 yellows and three reds in two seasons at the club. He was also part of a defence that conceded the least amount of goals in the 2005–06 Bundesliga season: 30 goals in 34 games.

Chelsea
On 18 August 2006, Chelsea agreed a fee with Hamburg to sign Boulahrouz. The fee was thought to be around £8.5 million (€12 million). After Chelsea's opening game of the 2006–07 season, manager José Mourinho confirmed that the club had signed Boulahrouz and the club but was waiting for his international clearance to be finalised, before speaking of the potential roles Boulahrouz will have in the side. On 21 August 2006, Chelsea completed the signing of Boulahrouz. Six days later, he was handed his Premiership début against Blackburn Rovers. He wore the number 9 shirt, previously occupied by Hernán Crespo.

Boulahrouz made a promising start to his Chelsea career, figuring prominently in high-profile games against Liverpool and more notably Barcelona where he dominated Ronaldinho. However, Boulahrouz gradually dropped out of favour. Boulahrouz was out for a lengthy period of time after a knee injury, followed by a shoulder injury while playing in an FA Cup tie against Norwich City. Boulahrouz eventually dropped out of contention as the season wound down, with John Terry and Ricardo Carvalho as the first-choice defensive pairing. When Carvalho was injured against Spurs, manager Mourinho paired Terry with Ghanaian midfielder Michael Essien.

Sevilla
Boulahrouz joined Spanish club Sevilla on a year long loan for the 2007–08 season. However, he played just six games for them and was deemed surplus to requirements. He returned to Chelsea in 2008 but was not given a squad number and made no appearances.

VfB Stuttgart
On 21 July 2008, Boulahrouz moved to VfB Stuttgart for a fee of around €5 million. He struggled in his first three seasons. Early in the 2011–12 Bundesliga season, however, Khalid became a regular in the starting line-up. The 29-year old defender had his 100th cap in the top German league on 17 September 2011 at SC Freiburg. Two weeks later, Boulahrouz scored his first goal (only his second in the Bundesliga) for Stuttgart on 30 September 2011. His goal came in the 69th minute of a 2–0 win over 1. FC Kaiserslautern.
In May 2012 VfB Stuttgart announced that the expiring contract of Khalid Boulahrouz won't be extended.

Sporting
On 18 July 2012 Boulahrouz signed a two-year contract with Sporting Clube de Portugal.