Ethnobotanical surveys on three new medicinal plants of Congo were undertaken in suburban localities of Pointe noire and Brazzaville. These are: Anomacanthus congolanus Brummitt (Acanthaceae), Byrsanthus brownii Guill. (Saliacaceae) and Croton dybowskii Hutch. (Euphorbiaceae). For each of them, are noted the used organ, the modes of preparation and administration of medicinal recipes and the treated pathology.