The town of Rothesay is the principal town on the Isle of Bute, in the county of Bute, Scotland. It features a late medieval castle surrounded by a moat and can be reached by ferry from Wemyss Bay which offers an onward rail link to Glasgow.

The town was long a popular destination for Glaswegians going "doon the watter" (lit: down the water, where the 'water' in question is the Firth of Clyde) and its wooden pier was once much busier with steamer traffic than it is today. The town also had an electric tramway which stretched across the island to one of its largest beaches. However, this closed in the mid 1930s.

The heir to the British Throne is known as the Duke of Rothesay in Scotland. However, unlike his equivalent English title of Duke of Cornwall, there is no land attached in the form of a Duchy. The main landowner is on the island is actually the Marquess of Bute.