List of number-one singles of 2009 (Ireland)This is a list of the IRMA's Irish Singles Chart Top 50 number-ones of 2009.Issue dateSongArtist1 January"Hallelujah"Alexandra Burke8 January"Hallelujah"Alexandra Burke15 January"Just Dance"Lady Gaga featuring Colby O'Donis22 January"Just Dance"Lady Gaga featuring Colby O'Donis29 January"Just Dance"Lady Gaga featuring Colby O'Donis5 February"Just Dance"Lady Gaga featuring Colby O'Donis12 February"Just Dance"Lady Gaga featuring Colby O'Donis19 February"Get On Your Boots"U226 February"Poker Face"Lady Gaga5 March"Poker Face"Lady Gaga12 March"Do You Believe"Julie-Anne Dineen19 March"Right Round"Flo Rida featuring Ke$ha26 March"Right Round"Flo Rida featuring Ke$ha2 April"Right Round"Flo Rida featuring Ke$ha9 April"Jai Ho! (You Are My Destiny)"A.R. Rahman & The Pussycat Dolls featuring Nicole Scherzinger16 April"Jai Ho! (You Are My Destiny)"A.R. Rahman & The Pussycat Dolls featuring Nicole Scherzinger23 April"We Made You"Eminem30 April"Poker Face"Lady Gaga7 May"Number 1"Tinchy Stryder featuring N-Dubz14 May"Number 1"Tinchy Stryder featuring N-Dubz21 May"Number 1"Tinchy Stryder featuring N-Dubz28 May"Number 1"Tinchy Stryder featuring N-Dubz4 June"Number 1"Tinchy Stryder featuring N-Dubz11 June"Untouched"The Veronicas18 June"When Love Takes Over"David Guetta featuring Kelly Rowland25 June"My Baby's Waiting"Industry2 July"When Love Takes Over"David Guetta featuring Kelly Rowland9 July"When Love Takes Over"David Guetta featuring Kelly Rowland16 July"I Gotta Feeling"The Black Eyed Peas23 July"I Gotta Feeling"The Black Eyed Peas30 July"I Gotta Feeling"The Black Eyed Peas6 August"I Gotta Feeling"The Black Eyed Peas13 August"I Gotta Feeling"The Black Eyed Peas20 August"I Gotta Feeling"The Black Eyed Peas27 August"Burn"Industry3 September"I Gotta Feeling"The Black Eyed Peas10 September"I Gotta Feeling"The Black Eyed Peas17 September"I Gotta Feeling"The Black Eyed Peas24 September"I Gotta Feeling"The Black Eyed Peas1 October"I Gotta Feeling"The Black Eyed Peas8 October"I Gotta Feeling"The Black Eyed Peas15 October"Bad Boys"Alexandra Burke featuring Flo Rida22 October"Fight for This Love"Cheryl Cole29 October"Fight for This Love"Cheryl Cole5 November"Fight for This Love"Cheryl Cole12 November"Fight for This Love"Cheryl Cole19 November"You Are Not Alone"The X Factor Finalists 200926 November"You Are Not Alone"The X Factor Finalists 20093 December"You Are Not Alone"The X Factor Finalists 200910 December"Bad Romance"Lady Gaga17 December"The Climb"Joe McElderry24 December"The Climb"Joe McElderry31 December"The Climb"Joe McElderry