2009 All-Ireland Under-21 Football Championship

{{short description|Gaelic football competition}}

{{Use dmy dates|date=April 2022}}

{{infobox

|title = 2009 All-Ireland Under-21 Football Championship

| image =

|bodyclass=vevent

|headerstyle = background:#BFD7FF;

|labelstyle=white-space: nowrap

|datastyle=white-space: nowrap

|header1=Championship details

|label2=Dates

|data2=

|label3=Teams

|data3=

|header4=All-Ireland Champions

|label5=Winning team

|data5=Cork (11th win)

|label6=Captain

|data6=Colm O'Neill

|label7=Manager

|data7=

|header8=All-Ireland Finalists

|label9=Losing team

|data9=Down

|label10=Captain

|data10=

|label11=Manager

|data11=

|header12=Provincial Champions

|label13=Munster

|data13=Cork

|label14=Leinster

|data14=Dublin

|label15=Ulster

|data15=Down

|label16=Connacht

|data16=Mayo

}}

The 2009 All-Ireland Under-21 Football Championship was the 46th staging of the All-Ireland Under-21 Football Championship since its establishment by the Gaelic Athletic Association in 1964.

Kerry entered the championship as defending champions, however, they were defeated by Cork in the Munster quarter-final.

On 4 May 2009, Cork won the championship following a 1-13 to 2-9 defeat of Down in the All-Ireland final.{{cite news|url=http://www.irishexaminer.com/breakingnews/sport/dramatic-late-winner-takes-victory-for-cork-409415.html|title=Dramatic late winner takes victory for Cork|publisher=Irish Examiner|access-date=16 July 2017|date=4 May 2009}} This was their 11th All-Ireland title overall and their first in two championship seasons.