The C-sharp dominant eleventh chord (abbreviated "C#11 chord") is a six-note chord consisting of the notes C, E, G, B, D, and F. The chord is formed by adding an eleventh to a C-sharp dominant ninth chord.

In practice, the third (E) and fifth (G) are often omitted from the C#11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.

Name
C-sharp dominant eleventh chord
Notes
C E G B D F
Intervals
1 3 5 7 9 11
Chord symbol
C11
Type
Hexad (six-note chord)

C#11 chord on piano

C#11 chord on guitar

C#11 chord on ukulele

C#11 chord on the staff