What does Nobita's teacher usually call him

Okay, this is an interesting question, and many fans watching Doraemon might have noticed this detail.

Doraemon's Teacher Usually Calls Him "Nobi"

That's right, just his surname—Nobi.

This actually has a lot to do with Japanese school culture. Let me explain why.

1. Why "Nobi" and Not "Nobita"?

Japanese Custom: In Japanese schools, teachers typically address students, especially boys, by their surnames, like "Suzuki" or "Sato." This is a common, formal way of addressing someone that maintains an appropriate distance. Nobita's full name is Nobi Nobita, so naturally, the teacher calls him "Nobi."
Indicating Closeness: Using the given name (like "Nobita") is usually reserved for family members or very close friends. Unless the relationship is exceptionally close, teachers rarely call students by their given names.

2. The "Tone" in the Address

In the anime, when the teacher calls "Nobi," it's usually with different emotions:

Angry or Scolding: This is the most common scenario! The teacher will shout loudly: "Nobi! You didn't hand in your homework again!" or "Nobi! Go stand in the hallway!" The address here is short and sharp, full of exasperation.
Asking a Question in Class: The tone is a bit more normal, like: "Alright, for this problem, Nobi-kun, please answer." In some Chinese dubs, this is sometimes translated as "Nobi-kun" or similar to make it easier for the audience to understand.
Almost Never "Nobita": You basically never see the teacher affectionately call him "Nobita," as it doesn't fit the established teacher-student relationship dynamic.

To Summarize:

So, the teacher most commonly uses Nobita's surname, 「Nobi」. This aligns with Japanese cultural norms and has become a classic scene in Doraemon—whenever the teacher shouts "Nobi!", we know Nobita is in trouble again.