Daftar bulanan lagu nomor satu tahun 2009 (Korea Selatan)
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Gaon Single Chart memberi peringkat lagu terbaik di Korea Selatan. Datanya diambil dari Korea Music Content Association tiap bulan.
Chart SejarahSunting
| Bulan | Lagu | Artis |
|---|---|---|
| Januari | "Gee" | Girls' Generation |
| Februari | ||
| Maret | "8282" | Davichi |
| April | "Lollipop" | Big Bang dan 2NE1 |
| Mei | "Fire" | 2NE1 |
| Juni | "Loner" (bahasa Korea: 외톨이) | Outsider |
| Juli | "I Don't Care" | 2NE1 |
| Agustus | "Abracadabra" | Brown Eyed Girls |
| September | "Heartbreaker" | G-Dragon |
| Oktober | "The Girl Who Can't Break Up, the Boy Who Can't Leave" (bahasa Korea: 헤어지지 못하는 여자, 떠나가지 못하는 남자) |
Leessang feat. Jung In |
| November | "You and I" | Park Bom |
| Desember | "Because of You" (bahasa Korea: 너 때문에) | After School |
| Note: all data can be retrieved through going to Gaon Chart and selecting the week. | ||