In this letter, we derive the explicit exact formulas for the finite temperature Casimir force acting on a pair of parallel plates in the presence of extra compactified dimensions within the framework of Kaluza-Klein theory. Using the piston analysis, we show that at any temperature, the Casimir force is always attractive and the effect of extra dimensions becomes stronger when the size or number of the extra dimensions increases. These properties are not affected by the explicit geometry and topology of the Kaluza-Klein space. Theories with extra space dimensions can be dated back to the work of Kaluza and Klein [1,2] in an attempt to unify gravity and classical electrodynamics. The advent of string theory has made the idea of extra dimensions indispensable [3]. Recently, the interest for physical models that contain extra warped dimensions come from the endeavor to explain the large gap between the Planck and electroweak scale (the hierarchy problem), and the dark energy and cosmological constant problem [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25]. In this letter, we are interested in studying the Casimir effect in the presence of extra compactified dimensions. The research on Casimir effect in the scenarios with extra dimensions have been studied in the context of string theory [26,27,28,29], dark energy and cosmological constant [16,17,18,19,21,22,25,30,31,32,33,34,35,36,37], as well as stabilization of extra dimensions [23,24,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53]. Casimir force for massless scalar field with Dirichlet boundary conditions on a pair of parallel plates inside space with extra dimensions compactified to a torus T n = (S 1 ) n have been calculated in [54,55,56,57,58,59]. The dependence of the Casimir energy on a cut-off scale was investigated in [25]. Casimir effect for electromagnetic fields confined between a pair of parallel and perfectly conducting plates in R d+1 was considered in [60]. In the case the extra dimension is compactified to a circle S 1 , it was studied in [25,61,62,63]. For the Randall-Sundrum spacetime model, the Casimir force due to massless scalar fields subject to Dirichlet boundary conditions on two parallel plates were calculated in [64,65,66].Despite the importance of the thermal corrections, most of the works mentioned above dealt with Casimir effect at zero temperature. In particular, we would like to mention the two papers by Cheng [56,58] where he calculated the Casimir force acting on a pair of parallel plates due to massless scalar field with Dirichlet boundary conditions in spacetime with n extra dimensions compactified to a torus. As pointed out in the comment [59], the earlier paper [56] concluded that the presence of extra dimensions will give rise to repulsive Casimir force under certain conditions. However, this result was invalidated by the author himself in the later paper [58], where he redid the calculations in a more physical setup known as piston [67] and concluded that the Casimir force shall always be attractive. The fini...