Résumé
Chittagong, Cox's Bazar and Chittagong Hill districts of Bangladesh were visited to know the traditional uses of orchids both epiphytic and terrestrial, used by the tribal people of these regions. Indigenous knowledge on different orchid species has been documented during the ethnobotanical survey by taking random interviews of herbalists and elderly people among the tribal communities viz. Chakmas, Tripuras, Maramas and Tanchinga. The family Orchidaceae is represented in Bangladesh by 160 species with 2 varieties. Of them, 26 orchid species were found ethnobotanically important and most of them were used for medicinal purposes. Some of them were used for fishing, dyeing, packaging and other purposes. Voucher specimens for each studied orchid species were collected, identified and preserved in the Herbarium of Chittagong University