Nadir Belhadj (Arabic: نذير بلحاج; born 18 June 1982) is an Algerian former professional footballer who played as a left-back.

Belhadj played a vital role for Qatari club Al Sadd in the 2011 Asian Champions League final, by beating South Korean side Jeonbuk Hyundai Motors 4–2 in a penalty shoot-out.

Belhadj scored the decisive penalty after the game had finished 2–2 in regulation time, holding his nerve to beat Kim Min-Sik.

[6] This was the first win for a Qatari club since the AFC Champions League started in 2003, and ended five consecutive triumphs for South Korea and Japan.

[citation needed] In January 2007, Belhadj signed for French champions Olympique Lyonnais for €3.24 million on a four-and-a-half-year contract.

On 30 December, Belhadj signed a four-and-a-half-year deal with Portsmouth, costing €4.5 million paid to Lens,[16] keeping him at the club until 2013.

[17] Although he has not always kept a first team place, his recall to face Liverpool on 20 December 2009 was an inspired move by Avram Grant as Belhadj was able to keep former Pompey favourite Glen Johnson under control.

[citation needed] During the 2011 summer transfer market several clubs showed interest, such as Celtic, Wigan and Wolves with Al Sadd rejecting all proposals as they viewed Belhadj as an important member of the team.

[20] He helped guide his team to the 2011 AFC Champions League title, defeating Jeonbuk Hyundai Motors in the final where he scored the game winning penalty in the shootout.

[citation needed] Since the 2010 World Cup and signing with Al-Sadd in the Qatar Stars League, Belhadj has seen his place at left-back for the national side slip away to Djamel Mesbah, ever since his calamitous appearance against the Central African Republic.