page_title: List of Billboard Adult Contemporary number ones of 2005
section_title: Chart history
hierarchical_section_title: List of Billboard Adult Contemporary number ones of 2005 / Chart history
caption_attribution_description: English: Michael Buble walks the Red Carpet at the 2009 Junos in Vancouver, Canada
context_page_description: Adult Contemporary is a chart published by Billboard ranking the top-performing songs in the United States in the adult contemporary music genre. In 2005, six different songs topped the chart in 53 issues of the magazine, based on weekly airplay data from radio stations compiled by Nielsen Broadcast Data Systems.
  In the first issue of Billboard of the new year, the number one song was "Believe" by Josh Groban, which was in its fourth week atop the chart. It remained at number one for two weeks in 2005 before being displaced by "Heaven" by Los Lonely Boys. The Chicano rock trio's song had spent ten weeks in the top spot in 2004 and added a further eight weeks to its total in 2005 to finish with a total of 18 weeks at number one. Despite this level of success, it was the group's only AC number one; although the band continued to record, releasing its most recent album in 2014, its final AC chart entry came in 2006. "Heaven" was displaced from the top spot by "Breakaway" by Kelly Clarkson, which went on to spend 20 consecutive weeks at number one. Clarkson won the first season of TV's American Idol in 2002 and quickly achieved a number of major pop hits.
caption: Michael Bublé topped the chart with "Home".
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