Both teach in and teach at are correct, but they answer different questions. Use in for an area, field, or room, and at for an institution or workplace.
Use teach at with a school, university, or institution: teach at Harvard. Use teach in with a country, city, classroom, or subject area: teach in Spain, teach in the science department.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use at for the institution where someone works as a teacher.
Use in for a physical area or location.
Use in for a subject area, department, or discipline.
The verb teach often takes a subject directly without a preposition.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
Cities and countries usually take in, not at.
✕ She teaches at Paris. ✓ She teaches in Paris.Schools and universities usually take at.
✕ He teaches in Lincoln High School. ✓ He teaches at Lincoln High School.Teach can take the subject directly.
✕ She teaches in mathematics. ✓ She teaches mathematics.Choose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
Yes. For example: She teaches at a university in Madrid.
Yes, when referring to working there as a teacher.
No. In a school can describe physical location inside the building, but at a school is more common for employment.
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