Learning may be defined as the ability to alter behavior based on experience. If there is nornlearning, there can be no memory later. Memory is the ability of an individual to record sensoryrnstimuli; events, information, etc. and retain them over short or long periods and recall the samernlater when needed. People chew khat believing that it improves memory, make them alert andrnthink clearly. This study was made to add to the existing body of knowledge about khat andrnmemory. To this effect, 36 albino mice, 6-8 weeks old, were administered orally with a singlerndaily dose of khat extract for 30 days. The animals were divided into four groups. The first grouprnserved as controls and was administered with 0.5 ml 3% Tween 80 in water. Group two (K100),rnthree (K200) and four (K300) were administered 100, 200 and 300 mg/kg khat extract,rnrespectively. The animals were then subjected to Multiple T maze (MTM) and Morris waterrnmaze (MWM) task performance. The result showed that subchronic administration of crude khatrnextract at doses used did not have a significant effect on learning using the two models. K200rn(p< 0.01) and K300 (p< 0.001) significantly impaired short-term memory in both models, whilernK100 impaired STM in MWM but not in MTM. Khat at all doses used did not have anyrnsignificant effect on long-term memory using both models. Crude khat extract administrationrnalso had initially anorexic effect but this was followed by development of tolerance. The resultsrncollectively showed that subchronic exposure of mice to khat could alter formation of short-termrnmemory, without affecting learning and long-term memory.rnIIrnKey Words: Catha edulis, learning, memory, short-term memory, long-term memory, Morrisrnwater maze task, Multiple T maze task.