Yes, you can absolutely use a Suica card in Osaka in 2026. Thanks to the "Nationwide Mutual Usage Service" for Japanese IC cards, Suica (originally from Tokyo) is fully compatible with the transportation networks in Osaka, Kyoto, and the wider Kansai region. You can use it to tap onto all JR West trains, the Osaka Metro, and local buses, just like the local ICOCA card. It also works at convenience stores and vending machines across Osaka. In 2026, many travelers prefer the Digital Suica on their iPhone or Android Apple/Google Wallet, which can be topped up instantly using a credit card. The only limitation is that you cannot use Suica for "one-way" travel that spans across different IC regions (e.g., you can't tap in at Tokyo Station and tap out at Osaka Station); for long-distance travel between cities, you must still purchase a Shinkansen ticket.