This is the complete list of (physical and digital) number-one singles sold in Finland in 2009 according to the Official Finnish Charts. The list on the left side of the box (Suomen virallinen singlelista, "Official Finnish Singles Chart") represents both physical and digital track sales and the one on the right side (Suomen virallinen latauslista, "Official Finnish Download Chart") represents sales of digital tracks.

Chart history Official Finnish Singles ChartOfficial Finnish Download ChartIssue dateSongArtist(s)RefIssue dateSongArtist(s)RefWeek 1 (December 30, 2008)"Hot n Cold"Katy PerryWeek 1"Hot n Cold"Katy PerryWeek 2 (January 6, 2009)"Poker Face"Lady GagaWeek 2"Poker Face"Lady GagaWeek 3 (January 13)Week 3Week 4 (January 20)Week 4Week 5 (January 27)Week 5Week 6 (February 3)Week 6Week 7 (February 10)Week 7Week 8 (February 17)Week 8Week 9 (February 24)Week 9Week 10 (March 3)"Serotonin"Widescreen ModeWeek 10"Serotonin"Widescreen ModeWeek 11 (March 10)"Ravistettava ennen käyttöä"ApulantaWeek 11"Ravistettava ennen käyttöä"ApulantaWeek 12 (March 17)"Poker Face"Lady GagaWeek 12"Poker Face"Lady GagaWeek 13 (March 24)Week 13Week 14 (March 31)"Lose Control"Waldo's PeopleWeek 14Week 15 (April 7)Week 15Week 16 (April 14)"Poker Face"Lady GagaWeek 16Week 17 (April 21)"Jos mä oisin sä"CheekWeek 17"Jos mä oisin sä"CheekWeek 18 (April 28)"Silver Bride"AmorphisWeek 18Week 19 (5 May)"Nyt huudetaan – Ihanaa,Leijonat, ihanaa (10v. remix)"Antero MertarantaWeek 19"Nyt huudetaan – Ihanaa,Leijonat, ihanaa (10v. remix)"Antero MertarantaWeek 20 (12 May)"Jos mä oisin sä"CheekWeek 20"Jos mä oisin sä"CheekWeek 21 (19 May)"Kesävainaja"ViikateWeek 21"Fairytale"Alexander RybakWeek 22 (26 May)"Nälkämaan laulu(Urhousremix 09)"DJ UrhoWeek 22Week 23 (June 2)"Fairytale"Alexander RybakWeek 23Week 24 (June 9)"Karkuri"JärjestyshäiriöWeek 24"Karkuri"JärjestyshäiriöWeek 25 (June 16)"C'est la vie"Anna PuuWeek 25"C'est la vie"Anna PuuWeek 26 (June 23)"Juuret"Antti TuiskuWeek 26"Jos mä oisin sä"CheekWeek 27 (June 30)Week 27"Poikkeus sääntöön"AsteWeek 28 (July 7)"Suudellaan"Lauri Tähkä & ElonkerjuuWeek 28Week 29 (July 14)"Jai Ho! (You AreMy Destiny)"A. R. Rahman & The Pussycat Dolls (feat. Nicole Scherzinger)Week 29"Jai Ho! (You AreMy Destiny)"A. R. Rahman & The Pussycat Dolls (feat. Nicole Scherzinger)Week 30 (July 21)Week 30Week 31 (July 28)Week 31Week 32 (August 4)Week 32Week 33 (August 11)"Celebration"MadonnaWeek 33"Celebration"MadonnaWeek 34 (August 18)Week 34Week 35 (August 25)Week 35Week 36 (September 1)Week 36Week 37 (September 8)Week 37Week 38 (September 15)"Kiitos ja kunnia"YöWeek 38Week 39 (September 22)"Celebration"MadonnaWeek 39Week 40 (September 29)"Pussy"RammsteinWeek 40"Pussy"RammsteinWeek 41 (October 6)"Polte päästä paratiisiin"Jarkko MartikainenWeek 41"Polte päästä paratiisiin"Jarkko MartikainenWeek 42 (October 13)"Frontrow Girl"White FlameWeek 42"Frontrow Girl"White FlameWeek 43 (October 20)"Polte päästä paratiisiin"Jarkko MartikainenWeek 43"Polte päästä paratiisiin"Jarkko MartikainenWeek 44 (October 27)Week 44Week 45 (November 3)"Umbrella"The BaseballsWeek 45"Umbrella"The BaseballsWeek 46 (November 10)Week 46Week 47 (November 17)Week 47Week 48 (November 24)Week 48Week 49 (December 1)"Kuollut kävelee"KotiteollisuusWeek 49Week 50 (December 8)"Umbrella"The BaseballsWeek 50Week 51 (December 15)Week 51Week 52 (December 22)"Bad Romance"Lady GagaWeek 52"Bad Romance"Lady Gaga

See also List of number-one albums of 2009 (Finland)

References