Taxonomy of Orchids

Like all living things, orchids have been classified by science under a system called Taxonomy.
Taxonomy is the science of classifying organisms.
Modern taxonomic classification, based on the natural concepts and system of the Swedish botanist Carolus Linnaeus, has progressed steadily since the 18th century, modified by advances in knowledge of morphology, evolution, and genetics.

For an excellent and detailed article on this subject please visit Wikipedia, the free encyclopedia, Taxonomy of the Orchidaceae Orchids Online has based the below classification on that document. Covered by the GNU Free Documentation License

Orchids are classified under the below family tree:-

Kingdom Plantae
Phylum Magnoliophyta
Class Liliopsida
Order Orchidales
Family Orchidaceae