| Diogenio Bigaglia | |
| Birth Date: | about 1676 |
| Birth Place: | Murano, Republic of Venice |
| Death Date: | about 1745 |
| Death Place: | Venice, Republic of Venice |
| Occupation: | Benedictine monk |
| Language: | Italian |
| Nationality: | Venetian |
Diogenio Bigaglia (about 1678–1745) was a Venetian monk, and a well-known composer and virtuoso of his time.
Bigaglia was born on the island of Murano, just north of Venice. He entered the Benedictine monastery of San Giorgio Maggiore in Venice in 1694. In 1700 he was ordained a priest, and in 1713 became the prior of the monastery.
He composed both sacred and secular vocal works. Of his larger sacred compositions little has survived. His instrumental music includes several polyphonic concerti and solo works, notably his 12 sonatas for violin or recorder (flauto) and basso continuo Opus 1, published by Le Cène in Amsterdam in about 1722 or 1723.