Mort's Dock is a former dry dock, slipway, and shipyard in Balmain, New South Wales, Australia. It was the first dry dock in Australia, opening for business in 1855 and closing more than a century later in 1959. The site is now parkland.

Mort Bay was originally known as Waterview Bay, and at the corner of the bay was the mouth of a small stream which ran down from Balmain Hill through the valley of Strathean. On its way to the harbour, the stream collected in small waterholes known as the "Curtis Waterholes" after the then landowner James Curtis.

In 1842 James Reynolds purchased from Curtis an area of land bounded by what is now Curtis Road down to the water front between Mort and Church Streets, dammed the stream, built a stone house called "Strathean Cottage" and sold fresh water to the ships anchored in the deep calm waters of the bay.

The land was then sold to Captain Thomas Rowntree in 1853, who recognised the site as a prime location for a patent slip. To finance his venture, Rowntree sold his ship the "Lizzie Webber" and in doing so, met auctioneer Thomas Sutcliffe Mort. With partner merchant J.S.Mitchell, Rowntree had formed the Waterview Bay Dry Dock Company. Rowntree had arrived in NSW in 1852, owning much land. He'd built the "Lizzie Webber" to carry English passengers to the goldfields and for Australian coastal trading. Mort further recognised the necessity for Sydney to provide docking facilities for ships needing repairs in the Colony, as at that time there were no such facilities south of Bombay, India. The location was ideal.

Proprietor and landlord Thomas Sutcliffe Mort had a flair for money-making. Building a dry-dock here, he created a building boom and large-scale development. Born in Bolton, Lancashire, and comfortably raised, he'd arrived in Sydney in 1838, working as a clerk and rising rapidly. By late 1843 Mort was organising wool auctions (the first to be held solely for wool), later of livestock and property. Organising wool sales in London, he was one of our first exporters and laid a pattern for future wool brokers. Mort's Wool Store at Circular Quay was designed by Edmund Blacket, on the site of today's Quay Quarter Tower. By 1850 Mort was Sydney's leading auctioneer with a fortune from land speculation in search of port space for his wool vessels.

Mort's Dock was the brainchild of industrialist Mort and former steamship captain T. S. Rountree (or Rowntree). Steam ships had first appeared in Sydney Harbour in 1853 but no repair or maintenance facilities existed to cater for the new vessels. In 1854, Mort and Rountree purchased an area of land at Waterview Bay on the northern side of the Balmain peninsula and excavated a dry dock measuring 123 by 15 metres (404 by 49 ft).

Rowntree and Mort formed the Waterview Bay Dry Dock Company (later Mort's Dock & Engineering Company) in 1853 and built Australia's first dry dock and patent slip on the site. Recognising the need, and despite the Government building a dry dock at Cockatoo Island, he started. He offered incentives: on completion, workers got a freehold block of land. The dock was operational by March 1855, one year before the Fitzroy Dock at Cockatoo Island Dockyard. Subdivisions and sales of Waterview Bay land followed the development, values spiraling when it opened. The first vessel serviced at the new Mort's Dock was the SS Hunter, a coastal mail steamer running between Sydney and Newcastle.

Mort had bought large tracts and as needs arose, sold. When the dock needed extensions (1866 and 1875), he met costs with more sales. By 1877 80% of the estate was settled by a working class population. The elite who had settled the area from the 1840s objected to pollution and industrial impediments to "their" marine views.