This is a list with K-Pop Groups that debuted in 2009.
Some of the most famous K-Pop Boygroups that debuted in 2009 are Beast (now known as Highlight) and MBLAQ.
Famous K-Pop Girlgroups that debuted in 2009 are T-ARA, 2NE1, f(x), SECRET, 4minute and After School.
| Profile | Name | Alt | Korean Name | Debut | Company | Members | Or. Members | Type | Fanclub | Active |
|---|---|---|---|---|---|---|---|---|---|---|
| Profile | 2NE1 | 투애니원 | 2009-05-06 | YG | 4 | 4 | Girl | Blackjack | No | |
| Profile | T-ara | 티아라 | 2009-07-29 | MBK | 4 | 6 | Girl | QUEEN'S | Hiatus | |
| Profile | 4Minute | 포미닛 | 2009-06-15 | Cube | 5 | 5 | Girl | 4nia | No | |
| Profile | After School | 애프터스쿨 | 2009-01-15 | Pledis | 6 | 5 | Girl | Playgirlz | No | |
| Profile | f(x) | 에프엑스 | 2009-09-05 | SM | 4 | 5 | Girl | MeU | No | |
| Profile | Rainbow | 레인보우 | 2009-11-12 | DSP | 7 | 7 | Girl | No | ||
| Profile | SECRET | 시크릿 | 2009-10-13 | TS | 3 | 4 | Girl | Secret Time | No | |
| Highlight | Beast | 하이라이트 | 2009-10-14 | Around Us | 4 | 6 | Boy | B2uty | Yes | |
| MBLAQ | 엠블랙 | 2009-10-14 | J. Tune | 3 | 5 | Boy | A+ | Yes |