Tallaganda National Park - Two sections of the Great Dividing Range south-east of Canberra support a range of forest habitats, including stringybark, scribbly gum, brown barrel and peppermint forest, as well as subalpine snow gum and mountain gum forest.

Tapin Tops National Park - High on the Great Escarpment, Tapin Tops National Park protects old growth forests and rainforests, and provides a unique habitat for threatened species such as the parma wallaby, squirrel glider and sphagnum frog.

Thirlmere National Park - Part of the Greater Blue Mountains World Heritage Area, this park's five reed-fringed freshwater lakes, abundant with waterbirds and surrounded by quiet patches of forest, are among the last undisturbed lake systems near Sydney and have enormous scientific value.

Tomaree National Park - Tomaree National Park conserves coastal bushland, sand dunes, heathland, forest areas and over 20 kilometres of rocky coastline and beaches. It is 50 kilometres north of Newcastle, fringing the towns and villages of Nelson Bay, Shoal Bay, Boat Harbour and Anna Bay.

Tooloom National Park - The Tooloom Scrub rainforest is World Heritage-listed, including important areas of red and flooded gum. There are 10 species of kangaroos and wallabies in the park, including the threatened long-nosed potoroo.

Toonumbar National Park - Extensive subtropical rainforests protect threatened plants and animals, including the sooty owl, red-legged pademelon and yellow-bellied glider.

Towarri National Park - Sandstone outcrops and scenic outlooks feature in a rugged landscape harbouring rainforests, snow gums and large grass tree stands.

Turon National Park - The open eucalypt forest and river oaks of historic Turon Valley were once the site of one of the state's major goldfields, and the area is rich in colonial and Aboriginal heritage.