The 73-time Poland international will give newly-promoted Benevento some valuable experience.
— Benevento Calcio (@bncalcio) August 11, 2020
Glik made 167 appearances and scored 16 goals in the red and white of Monaco.
Benevento are reported to have paid around €3m for Glik, who has signed a three-year deal.
The Campanian club, coached by Filippo “Pippo” Inzaghi, are working on more deals to strengthen the side.
A move for Parma winger Gervinho is still on the cards and they hope to persuade Giacomo Bonaventura to join them after he left AC Milan.
A proposed move for French striker Loic Remy collapsed after he failed medical tests.