What is the collective noun for ballerina?

There isn't a specific, widely accepted collective noun for ballerinas. However, you could use some of these options:

Formal:

* Company (This is the most common, as ballerinas often perform as a group within a ballet company)

* Ensemble (Refers to the group of dancers in a performance)

* Corps de ballet (The group of dancers who perform as a unified entity in a ballet)

Informal:

* Troupe (This suggests a group of performers, especially dancers)

* Ballet (This could work if you are specifically referring to the group of ballerinas as a performance)

* Group (A simple and straightforward option)

* Cast (If the context is specifically about a performance)

Ultimately, the best collective noun depends on the context and your desired tone.