Abstract: Olive is native plant of the Hatay province of Turkey. Fifty-one olive groves surveyed twice during 2003-2004 growing season. Ninety-two weed species were determined, which belong to 29 plant families. One third of species was from two families of class Monocotyledoneae and the others were from class Dicotyledoneae. Most common families were Poaceae, Asteraceae and Fabaceae. Glycyrrhiza glabra L., Sorghum halepense (L.) Pers. and Convolvulus arvensis L. were the most dense species. G. glabra L. (81.6%), S. halepense (L.) Pers. (81.4%), Portulaca oleracea L. (76.1%), Prosopis farcta (Banks. and Sol.) Macbride (69.7%) and C. arvensis L. (68.8%) were the most common weeds.