Royal Oak Inn, Rouse Hill, Historic inn in Rouse Hill, New South Wales, Australia.

The Royal Oak Inn is a single-storey building on the corner of Windsor and Commercial Roads in Rouse Hill, built in 1829 and later used as a residence. It has also been known as the Queens Arms Inn and is now the Fiddler Hotel. The original shingle roof was replaced with tiles between 1916 and 1925.

The site was part of a 15-hectare grant to former convict Charles Davis in 1818. In 1829 he leased land to William Cross, licensee of the nearby White Hart Inn, and the first publican's licence for the inn was issued to Cross in 1830. John Booth bought the inn in 1841, renamed it the Queens Arms, then the Royal Oak in 1845. The licence lapsed after licensee John Seath died in 1876, and the building became a residence between 1916 and 1925.

The inn represents early colonial hospitality culture in New South Wales, functioning as a social hub where travelers, mail carriers, and local residents gathered, demonstrating the important role such establishments played in community development and communication networks.

The inn stands at the corner of Windsor Road and Commercial Road in Rouse Hill, in The Hills Shire. It was added to the New South Wales State Heritage Register on 2 April 1999. The property is privately owned and is currently known as the Fiddler Hotel.

The inn retains original stone cellars, brick kitchens, and remnants of a blacksmith's shop, making it one of the few surviving examples of a complete 1820s coaching inn complex that illustrates the multifunctional nature of early colonial hospitality establishments.