Doryanthes excelsa, commonly known as the gymea lily, is a flowering plant in the family Doryanthaceae that is endemic to coastal areas of New South Wales near Sydney.

Gymea lilies have a rosette of large numbers of sword-shaped, strap like leaves 1–2.5 metres (3–8 ft) long and 10 centimetres (4 in) wide.

[3][4] In winter the flower spike grows from the centre of the rosette until it is up to 6 metres (20 ft) high, bearing shorter leaves up to 30 centimetres (10 in) long.

[5][6] Doryanthes excelsa was first formally described in 1802 by the Portuguese polymath, José Correia da Serra from the type specimen collected by George Bass "in mountainous parts of the colony of N.S.W.".

[4] "Doryanthes" has inspired the naming of the journal of history and heritage for Southern Sydney founded by Dharawal historian Les Bursill.

It grows specifically on slopes that face south or southeast, along creeks, gullies or sheltered plateaus and ridges, at elevations of 100–200 metres above sea level.

[12] Gymea lilies are hardy and adaptable plants often used in landscape gardening, not only in the Sydney region but also in other coastal areas such as Brisbane and Perth.