Renanthera, abbreviated as Ren in horticultural trade, is a genus of large scrambling monopodial epiphytic and terrestrial species of orchid found in China, the Himalayas, Southeast Asia, New Guinea, and Melanesia.

[3][4][5] Species in this genus produce a branched inflorescence containing numerous flowers ranging in color from yellow and orange to red.

These flowers possess large lateral sepals.

[5] The following species ordered by sections are recognized by Plants of the World Online As of May 2024[update]:[6] Species in this genus usually require an intermediate to hot climate with good air movement and generally bright light.

Their scrambling style of growth means they are best grown on a hanging mount or basket.