Allocasuarina thalassoscopica is a species of flowering plant in the family Casuarinaceae and is endemic to eastern Australia.

Male flowers are arranged in spikes 5–45 mm (0.20–1.77 in) long, with mostly 6 to 10 whorls per centimetre (per 0.39 in.

[4][5] The specific epithet, (thalassoscopica) means "sea-watcher", referring to its situation on a mountain slope, facing the sea.

[4] This she-oak forms a dense, low, closed heath on the windswept south-facing upper slopes of Mount Coolum and along the coast from Noosa Heads in south-east Queensland to Diamond Beach in northern New South Wales.

[7] The main threats to the species are vegetation clearing and inappropriate fire regimes.