文心兰属（学名：Oncidium）是树兰亚科的一个属，包含了约330种兰科植物。

这是个复杂难辨的属，其下的许多种正在进行重新分类。不少人呼吁将本属划分为多个不同的属。

Oncidium, abbreviated as Onc. in the horticultural trade, is a genus that contains about 330 species of orchids from the subtribe Oncidiinae of the orchid family (Orchidaceae). As presently conceived (May 2014), it is distributed across much of South America, Central America, Mexico and the West Indies, with one species (O. ensatum) extending into Florida. Common names for plants in this genus include dancing-lady orchid and golden shower orchid.