2005 жылғы жеңіл атлетика әлем чемпионаты Хельсинкиде

10th World Championships in Athletics

The 10th World Championships in Athletics (, Världsmästerskapen i friidrott 2005), under the auspices of the International Association of Athletics Federations (IAAF), were held in the Olympic Stadium, Helsinki, Finland (6 August 2005 – 14 August 2005), the site of the first IAAF World Championships in 1983. One theme of the 2005 championships was paralympic events, some of which were included as exhibition events. Much of the event was played in extremely heavy rainfall.

The original winning bid for the competition was for London but the cost to build the required stadium at Picketts Lock and host the event was deemed too expensive by the government. UK Athletics suggested to move the host city to Sheffield (using Don Valley Stadium), but the IAAF stated that having London as the host city was central to their winning the bid. The championships bidding process was reopened as a result. The United Kingdom's withdrawal as host was the first case for a major sporting event in a developed country since Denver's withdrawal as host of the 1976 Winter Olympics. Helsinki was considered by many to be the outsider in the race to host the games with rival bids being presented by Berlin in Germany; Brussels in Belgium, Budapest in Hungary, Moscow in Russia and Rome in Italy.

Apocalyptica and Nightwish performed at the opening ceremony of the event over a heavy rainfall. Geir Rönning, Finland's Eurovision Song Contest 2005 entrant, sang "Victory" the official song of the 2005 IAAF World Championships.

The IAAF conducted their largest ever anti doping program at an athletics event for the championships, with 705 athletes subjected to a total 884 of tests. There were two athletes who failed drugs tests: Indian discus thrower Neelam Jaswant Singh tested positive for the stimulant pemoline, and Vladyslav Piskunov, a Ukrainian hammer thrower, tested positive for the steroid drostanolone. Singh received a two year ineligibility ban, while Piskunov received a life ban from athletics as this was his second offence. In March 2013, the IAAF announced that re testing of samples taken during these championships revealed that five medal winners had proved positive for banned substances. The athletes involved were Belarusian Nadzeya Ostapchuk (shot put gold), Belarusian Ivan Tsikhan (hammer throw gold), Russian Olga Kuzenkova (hammer throw gold), Russian Tatyana Kotova (long jump silver) and Belarus's Vadim Devyatovskiy (men's hammer silver). Belarusian Andrei Mikhnevich (shot put 6th) had also tested positive and was disqualified.

To commemorate the 2005 World Championships in Athletics the Finnish government issued a high value commemorative euro coin, the €20 10th IAAF World Championships in Athletics commemorative coin, minted in 2005. The obverse of the coin features Helsinki Olympic Stadium and above the stadium random waves express the feeling of the games.