The 2005 Southeast Asian Games (Filipino: Palaro ng Timog Silangang Asya 2005), officially known as the 23rd Southeast Asian Games was a Southeast Asian multi-sport event held in Manila, Philippines.

This was the third time the Philippines hosted the games and its first time since 1991. Previously, Philippines also staged the games for the first time in 1981. This was also the first time that the opening and closing ceremonies were held in an open field instead of a stadium, setting the record for the world's largest live audience in an opening ceremony with 200,000 people at the Quirino Grandstand. These games were also noted for having the most number of delegates in the history of the SEA Games at that time. Around 5336 athletes from 11 participating nations participated at the games which featured 443 events in 40 sports. The games was held from 27 November to 5 December 2005, although several events commenced on 20 November. The games was opened and closed by Gloria-Macapagal Arroyo, the President of the Philippines at the aforementioned venue.

The final medal tally was led by host Philippines, followed by Thailand and Vietnam. Several Asian, Games and national records were broken during the games. Though there were several controversies, the games were deemed generally successful with the rising standard of competition amongst the Southeast Asian Nations.

The Philippine SEA Games Organising Committee (PhilSOC) was formed to oversee the staging of the games.

Metro Manila served as the main hub of the Games, though several events also took place in Bacolod City, Cebu City, Los Baños and Canlubang in Laguna, Tagaytay City in Cavite province, Angeles City in Pampanga.

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