| Lo frate 'nnamorato | |
|---|---|
| Commedia musicale by G. B. Pergolesi | |
 Titlepage of the 1734 libretto | |
| Translation | The Brother in Love |
| Librettist | Gennaro Antonio Federico |
| Language | Neapolitan and Italian |
| Premiere | 27 September 1732 |
Lo frate 'nnamorato (Neapolitan: The Brother in Love) is a three-act commedia per musica (a form of opera buffa) by Giovanni Battista Pergolesi, to a Neapolitan libretto by Gennaro Antonio Federico, first performed in 1732.