An ethnobotanical study was carried out to document infonnation on the use of medicinalrnplants by the Maasai people living at the vicinity of Lake Manyara National Park', MondulirnDistrict in Arusha, Tanzania. Six villages or study sites were chosen randomly: Mto wa Mhu,rnMoyamayoka, Losirwa, Silale, Selela and Ngo'goro. It was assumed that indigenousrnknowledge related to biodiversity conservation and use of medicinal plants of this culturalrngroup of people was getting lost or not well documented.rnThe main method of study was based on semi-structured interviews and discussion withrnselected infonnants (Maasai elders and healers). A vegetation survey was conducted torninvestigate the habitat status of the reported medicinal plants between the protected area insidernLake Manyara National Park and outside the park for conservation and monitoring purposes.rnA total of 54 plant species belonging to 33 families and 44 genera were cited as being used byrnthe Maasai of Manyara for their medicinal value. Of these medicinal plants, 49 plant speciesrnor 90% were trees and shrubs. Very few grasses and climbers are used. The result fromrnKruskall-Wallis and Friedman's test shows that there is high significant difference (**P