A three-dimensional finite element technique was used to analyze behaviour of laterally loadedrnsingle pile subjected to pure static lateral load. The main objective of this study is to assess therninfluence of the pile diameter, pile length and site condition on the behaviour of laterally loadedrnsingle pile embedded in layered soils. Most of the studies were focused on the behaviour ofrnlaterally loaded pile embedded in homogenous soils, but in this study behaviour of laterally loadedrnpile embedded in layered soils was considered. rnA lateral load behavior of single piles in three different sites located in Addis Ababa city werernstudied with different diameter and length of pile. The analysis was carried out by considering freernheaded flexible piles. Full scale field test result obtained from the literature was used for the rnvalidation of Plaxis 3D Foundation FEM. Lateral deflection, bending moment and shear force wererncalculated for piles with different diameter and length for each three sites and their results werernpresented. rnIn this study the result shows that the head deflection of a pile, lateral pile displacement,rndistribution of bending moment, distribution of shear force along the pile length and lateral soilrnresistance were influenced by pile diameter and site conditions. The analysis indicated that thernhead deflection of the pile decreased with increase in pile diameter since its stiffness was increasedrnbut remain constant with increase in length of pile since the embedded length of the pile is greaterrnthan its critical length. Increase in pile diameter increased in ultimate lateral load capacity, bendingrnmoment and shear force along the pile length and remain constant with increase in pile length. Inrnaddition, the location and the thickness of the hard stratum near to the ground surface has a greatrnrole in the response of laterally loaded piles.