The UK Singles Chart is one of many music charts compiled by the Official Charts Company that calculates the best-selling singles of the week in the United Kingdom. Since 2004 the chart has been based on the sales of both physical singles and digital downloads, with airplay figures excluded from the official chart. This list shows singles that peaked in the Top 10 of the UK Singles Chart during 2009, as well as songs which peaked in 2008 or 2010 but were in the top 10 in 2009. The entry date is when the song appeared in the top 10 for the first time (week ending, as published by the Official Charts Company, which is six days after the chart is announced).
One-hundred and twenty-eight songs were in the top ten in 2009. Eleven singles from 2008 remained in the top 10 for several weeks at the beginning of the year, while "TiK ToK" by Kesha, "Starstrukk" by 3OH!3 featuring Katy Perry, "Don't Stop Believing" by Journey, "Look for Me" by Chipmunk featuring Talay Riley, "The Climb" by Joe McElderry and "3 Words" by Cheryl Cole featuring will.i.am were all released in 2009 but did not reach their peak until 2010. "Broken Strings" by James Morrison featuring Nelly Furtado was the only song from 2008 to reach its peak in 2009. Forty-two artists scored multiple entries in the top 10 in 2009. Emeli Sandé, Lady Gaga, Michael Bublé, Pixie Lott and Tinchy Stryder were among the many artists who achieved their first UK charting top 10 single in 2009.