Yes, you can return a completely unused Japan Rail Pass for a refund, provided the "Exchange Order" (the voucher you receive before going to Japan) has not been exchanged for the actual pass and has not expired. Most authorized vendors allow returns within one year of the issue date. However, there are significant conditions: you will almost always be charged a 15% cancellation fee of the total pass price. To get your refund, you must physically mail the original, undamaged voucher back to the office where you purchased it. If you have already arrived in Japan and exchanged the voucher for the physical pass, you can still get a refund at a JR ticket office only if the pass's validity period has not started yet. Once the pass is active or the start date has passed, it is generally non-refundable and non-exchangeable, regardless of whether you used it.