Guilfoylia is a monotypic genus of flowering plants belonging to the family Surianaceae.

[2] Its native range is eastern Australia, and found in the states of New South Wales and Queensland.

[2] The genus name of Guilfoylia is in honour of William Guilfoyle (1840–1912), an Australian landscape gardener and botanist.

[3] The Latin specific epithet of monostylis is derived from mono meaning one and stylis referring to the style.

[2] List of Australian plant species authored by Ferdinand von Mueller