Poa flabellata, commonly known as tussac grass or just tussac, is a tussock grass native to Patagonia, the Falkland Islands, South Georgia and other islands in the South Atlantic. There are also two isolated records from the herbarium at the French Muséum national d'histoire naturelle for the Île Amsterdam in the Indian Ocean.

It was introduced to Shetland, Scotland for basket making in 1844, and possibly as a source of fodder because of its ability to grow in hostile conditions..

It grows in dense clumps, usually about 2 metres (6 ft 7 in) high (although they can be much taller), on wet coastal land and is a dominant feature of much of the landscape.

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