The relationship, which had since ended, involved multiple encounters over a two-year period.
Police said Sarah Fowlkes, a high school science teacher, was "engaged in sexual contact" with a 17-year-old at the school.
A Chester County teacher's aide was arrested after police say she had sexual contact with two male students.
A Camden County teacher is facing charges that he sexually assaulted a female student.
Lauren Mitchell, 32, of Lyndhurst, is being held on 150,000 bail. She was arrested June 19.
