Drosera hamiltonii is a species of sundew that is endemic to the southern coast of Western Australia.

Drosra hamiltonii is a medium sized sundew that grows around 5cm in diameter. The leaves lie flat and are long and rounded at the ends. They roll outwards from the center of the plant as they unfurl and develop. The flower scapes are fleshy and covered in small glands. The flowers are pink. The styles are unusual for the genus in that they are fused together to form a single tube. The plants are usually green or olive with red tentacles and can attain a brick red colour in exposed conditions.

The species inhabits swamps that straddle West Australia’s south coast. The plants are usually found in the sloped terrain at the periphery of the swamps where water seeps out of the ground, and is often sympatric with Cephalotus. It is most commonly observed after fire has cleared the thick growth in the habitat. The species does not enter seasonally induced dormancy but growth can be suppressed by thick regrowth in years between bushfires.

Drosera hamiltonii is unlikely to be confused with other species within its range. It is distinguishable from other rosetted Australian species in the way its leaves seem to ‘roll out’ as they unfurl. Its pink flowers are completely unique within the genus for having fused styles. For this reason, the species is elevated to its own subgenus – Drosera subg. Stelogyne.