Ridsdalea is an Asian genus of plants in the family Rubiaceae; it was named after Dr. Colin Ernest Ridsdale (1944–2017), who was an English botanist and specialist in tropical plants and the Rubiaceae family.

[3] The type species is Ridsdalea grandis (Korth.)

J.T.Pereira, which was renamed from the basionym Gardenia grandis.

Its native range is southern China, Indo-China, Malesia and New Guinea.

As accepted by Plants of the World Online,[4] and IPNI list:[2]