Igor Astarloa Askasibar (born March 29, 1976) is a retired cyclist from Spain.

Astarloa turned professional with the Italian cycling team Mercatone Uno and enjoyed his best season in 2003 with team Saeco when he won the Flèche Wallonne and the road race title at the World Cycling Championships at Hamilton, Canada.

Team Milram terminated its contract with Astarloa in May 2008 following disclosures that he had shown "irregular blood values", as reported by Focus magazine.

[5] On 1 December 2010, the Union Cycliste International announced that the Spanish Cycling Federation’s Disciplinary Commission had handed down a two-year suspension and a €35,000 fine to Igor Astarloa.

According to Cyclingnews.com, Astarloa's blood samples had come under considerable scrutiny prior to the events of 2008-09 and in the wake of his 2003 world championships victory, although he was never punished for any infraction.