For many years, ?uid ?ow around bluff bodies including circular and square cylinders has been well studied. In spite of their simple geometry, the formation of ?ow around these types of geometries contains the main ?ow characteristics such as separation and reattachment, wake, shear layer instabilities and vortex shedding. Cylinder-like structures can be found both alone and in groups in the designs for heat exchangers, cooling systems for nuclear power plants, offshore structures, buildings, chimneys, power lines, struts, grids, screens, and cables. Various studies including both numerical and experimental investigations have been conducted for the ?ow over two-dimensional square cylinders in different arrangements, where the effects of floor (wall) and roof (free flow) of the cylinders are not included. In reality, most of cylindrical structures such as buildings have finite height with a wall in one end and free flow in another end. This case is a type of three dimensional bodies. Furthermore, when an object is in the wake of another, flow properties and aerodynamic forces are affected by geometry, distance between two structures and their placement toward the flow. In this research the flow around two side by side square cylinders with limited height (same as two side by side buildings) is studied experimentally by using wind tunnel and smoke tunnel. Experiments were performed in Isfahan University of Technology labs. The aspect ratio of the models (side/height) is 7. The distance between the models is varied between 2D to 6D, where D is cylinder side. The pressure coefficients (Cp) on the models’ faces are measured via 53 sensors which are placed on theirs’ faces. In this test the Cp is measured in different gap distances and angles of attack. The flow patterns around two cylinders are investigated by smoke visualization for different gap spacing. Measuring velocity field and turbulence quantities around two side by side square cylinders are carried out using hotwire anemometry on the middle height of the cylinders for various gap distances.Results of this study show that the variations of the gap distance and angle of attack have important effects on the flow patterns and pressure and velocity quantities. Also it was found that the results for three dimensional cylinders differ from those are reported for two dimensional cylinders. Some similarity is observed between results of the two dimensional cylinders and those for the middle plane of three-dimensional cylinder, where the effects of the floor and roof of the models on the results of this plane are small. This study shows that the results are relatively independent to Reynolds numbers considered in this work. Keywords: Two side by side three dimensional square cylinders, Wind tunnel, Smoke tunnel, Experimental study.