William the Fourth was a 54-ton wooden paddle steamer built by Marshall & Lowe, Erringhi (now Clarence Town), New South Wales, Australia.

[1] She was the first oceangoing steamship built in Australia when launched in 1831.

She plied the East Coast of New South Wales until 1863, when she sailed to China[2] and was sold and operated on the Shanghai–Ningbo route.

[3] A replica was built at Raymond Terrace from 1985 to 1987 as part of the Australian Bicentenary and was launched by Hazel Hawke on 26 September 1987.

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