Yes, you can use a Japan Rail (JR) Pass to travel between Kyoto and Tokyo, but there is a major catch regarding the speed of your journey. The JR Pass covers the Hikari and Kodama Shinkansen (bullet trains) on the Tokaido line, which take about 2 hours 40 minutes and 4 hours respectively. However, the fastest train, the Nozomi, is not fully covered. To ride a Nozomi train with a JR Pass in 2026, you must purchase a special "Nozomi MIZUHO Ticket" separately before boarding. Following the significant 2023 price hike, many travelers now find it more cost-effective to simply buy a single-way Shinkansen ticket (approx. ¥14,000) rather than a full 7-day pass, unless they plan on multiple long-distance trips. You can reserve seats for free with your pass at any JR ticket office or via the official JR reservation portal if you purchased your pass directly from the JR website.