UFC 315: Muhammad vs. Della Maddalena was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on May 10, 2025, at the Bell Centre in Montreal, Quebec, Canada.

The event marked the promotion's eighth visit to Montreal and first since UFC 186 in April 2015.

A UFC Welterweight Championship bout between current champion Belal Muhammad and Jack Della Maddalena headlined this event. Ian Machado Garry served as backup and potential replacement for this fight.

A UFC Women's Flyweight Championship bout between current two-time champion Valentina Shevchenko and Manon Fiorot took place in the co-main event.

A welterweight bout between former welterweight title challenger Gilbert Burns and Michael Morales was scheduled for UFC 314. However, the pairing was moved to this event due to undisclosed reasons. In turn, the bout was moved to UFC Fight Night: Burns vs. Morales to serve as the main event.

A women's bantamweight bout between Nora Cornolle and Hailey Cowan was expected to take place at this event. However, the bout was moved to UFC 314 for unknown reasons.

Gavin Tucker was expected to face Lee Jeong-yeong in a featherweight bout at the preliminary card. However, Tucker pulled out in late April due to undisclosed reasons and was replaced by Daniel Santos.

A lightweight bout between Benoît Saint Denis and Joel Álvarez was scheduled for this event. However, Álvarez withdrew from the fight due to a hand injury and was replaced by returning veteran Kyle Prepolec.