Lady's slipper orchids, lady slipper orchids or slipper orchids are the orchids in the subfamily Cypripedioidea, which includes the genera Cypripedium, Mexipedium, Paphiopedilum, Phragmipedium and Selenipedium. They are characterised by the slipper-shaped pouches (modified labellums) of the flowers – the pouch traps insects so they are forced to climb up past the staminode, behind which they collect or deposit pollinia, thus fertilising the flower. This subfamily has been considered by some to be a family Cypripediaceae, separate from the Orchidaceae. The subfamily Cypripedioideae is monophyletic and consists of five genera. Their common features are two fertile diandrous (that is, with two perfect stamens) anthers, a shield-shaped staminode and a saccate (sac-shaped) lip. The Cypripedium genus is found across much of North America, as well as in parts of Europe. The state flower of Minnesota is the Showy Lady's Slipper (Cypripedium reginae). The Pink Lady's Slipper, (Cypripedium acaule), is the official state wildflower of New Hampshire.

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