Incat Tasmania is an Australian manufacturer of high-speed craft (HSC) catamaran ferries. Its greatest success has been with large, sea going passenger and vehicle ferries, but it has also built military transports and since 2015 it has built smaller river and bay ferries. Based in Derwent Park, a suburb of Hobart, Tasmania, Australia, it was founded by Bob Clifford.

The company builds vessels using aluminium construction, wave-piercing and water-jet technology. Vessels have been constructed up to 130 metres in length with a size of 13,000 gross tons and with cruising speeds of up to 58 knots (107 km/h).

The company began in the 1970s as the Sullivans Cove Ferry Company in suburban Hobart and built four small ferries before International Catamarans was formed in 1977 by a partnership between founder Bob Clifford and marine architect Philip Hercus. This partnership created plans for what was probably the first large wave piercing catamaran in the world. However the partnership was dissolved in 1988 with Clifford remaining in Hobart trading as Incat Tasmania while Hercus returned to Sydney to establish Incat Designs (Sydney), a design-only company that became Incat Crowther after a merger in 2005. Incat Crowther has no association with Incat Tasmania and its ships are built by other companies. Incat Tasmania has its own in-house design company, Revolution Design.

In 1989 Incat Tasmania moved to its present location on Prince of Wales Bay, which allowed it to build larger ships, and in 1990 Incat delivered its first 74-metre fast catamaran ferry. At the same time, several other companies also began to build large aluminium vehicle carrying ferries. This new type of ship was revolutionary and over the next decade fast cats replaced most hydrofoil and hovercraft services as well as many monohull ferries. The success of this new type of ferry led to other shipbuilders around the world using their yards to build large vehicle carrying aluminium catamarans. However many ferry operators preferred traditional monohull designs and the limited market for fast cats became crowded with manufacturers bidding low to keep their shipyards working.

After the inevitable collapse of the industry, two builders of large catamaran ferries survived, Incat and its Perth based rival Austal. However Incat had needed to downsize and after a brief stint in receivership, the company continued building ferries and developing larger and more efficient designs. With diversification into smaller bay ferries in 2015 and the recovery of the market for large vehicle carrying ferries, Incat Tasmania's workforce expanded rapidly from 2015.

In its early years Incat built smaller boats and ferries with little to distinguish it from other boat yards except for a willingness to experiment and innovate. But the revolutionary Hull 023 completed in 1990 was quite different and was the first of the type of ferry that Incat is best known for today with its large capacity, high speed, wave piercing hulls and distinctive centre bow. As one of the first large aluminium vehicle carrying catamarans in the world, it contributed to the big changes in the ferry industry that occurred in the 1990s.

In the "Length / class" field of the table WPC means the vessel is a wave piercing catamaran. The three K class vessels were a low profile design without the wave piercing bows and the capacity to carry fewer cars than traditional Incat designs.

In the competitive ferry industry, ships often change operators, especially in Europe. Other ferries have alternated between summer service in the northern and southern hemispheres every six months. Some Incat vessels of the 1990s have been operated by up to six shipping companies with regular name changes.

Gross tonnage is a measure of a ship's enclosed volume rather than its weight or displacement, so similar ships can have differing gross tonnages due to factors such as whether a viewing platform is fully enclosed or open to the weather.