One of the hot research topics nowadays is structural health monitoring. The most useful damage location methods (based on dynamic testing) are probably those using changes in resonant frequencies. This study is concerned with parametric study of the effect of dead loads on the natural frequencies of beams. The study includes two types of dead loads; distributed and concentrated loads for different models. The first ten mode frequencies are studied for each model. Based on the numerical results, it is shown that both distributed and concentrated loads have considerable influence on the lower frequencies of beams, especially the fundamental one. Also, it is found that the influence of dead loads on beam frequencies depends on cross- section moment of inertia and span-length. Furthermore, it is found that the effect of dead loads decreases with the increase of number of beam spans. Also, certain cases of loadings provide high change of frequencies due to dead loads. On the other hand, the percentage changes of frequencies due to dead loads with different values of mass density and modulus of elasticity are the same.