Leichhardtia tubulosa is a species of plant of unknown habit in the dogbane family, first described by Ferdinand von Mueller in 1875 as Marsdenia tubulosa.

[1] It is endemic to Australia's subtropical Lord Howe Island in the Tasman Sea.

[2] It is known only from a single collection, made in 1871 on the summit of Mount Gower,[3] and is believed to be extinct.

[1] The plant has semi-circular leaves about 45 mm long and small tubular flowers.

The specific epithet refers to the tubular corollas.