Unfortunately not all tickets can be cancelled.

Regional trains:
Ordinaria tickets can be cancelled the day before departure for a 20% fee.
Trenord tickets and tickets to and from Fiumicino Airport cannot be cancelled.

Intercity and Freccia trains:
Base tickets can be cancelled before departure for a 20% penalty.
Super Economy, Economy, 2x1 special offer and Same day return tickets cannot be cancelled or refunded.

Eurocity and Thello trains (international):
Adult and Standard tickets can be cancelled for a fee.
Mini, Smart and Smart 2 tickets cannot be cancelled or refunded.

To cancel your ticket visit your bookings page to submit your request and claim your refund.