The Triple J Hottest 100 is an annual music poll, based on the votes of national Australian radio station Triple J listeners, in order to determine their favourite song of the year. Voting is conducted by the internet and begins roughly two weeks prior to the new year for the previous year's songs. The 100 most popular songs are then counted down on Australia Day weekend – usually Australia Day itself, 26 January.

The poll had been conducted by DoubleJay in Sydney starting in the 1980s, before Triple J became a national broadcaster. It was originally called the Hot 100 and ran on New Year's Day. The Brisbane independent radio Station 4ZZZ had run a survey under the same name and on the same day since 1977 and owned the rights to the name Hot 100. Triple J was legally required to change the name of its annual survey.

The poll attracts over half a million votes every year (increasing constantly from 500,000 in 2004 to 1.26 million in 2011). Triple J and other sources claims that it is the world's largest music poll. It began as a write-in poll; it then progressed to phone in, then they started listing the songs for the year so it could be done automatically via SMS and web voting. In 2003, it was only possible to vote on the Triple J web site; registration was required and limited to 10 votes. In 2004 this was expanded to 10 internet votes, and 10 SMS votes.