A Melbourne high school teacher has been found guilty of committing an indecent act on a child under 16 but has been cleared of a charge that she had sex with the student.

Nazira Rafei, 26, sobbed as the verdict was delivered today after prosecutors had alleged she struck up a friendship with the 15-year-old boy outside school.

It was claimed the pair had sex, hugged and kissed.

The jury also found Rafei not guilty of a second charge of committing an indecent act with a child under 16.

During the two-week trial in the Victorian County Court, jurors heard the pair first met outside school during a teachers' strike on Valentine's Day last year.