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This paper investigates the dynamic behavior of functionally graded beam in the thermal environment due to a moving harmonic load. The material properties are assumed to be graded in the thickness direction by a power-law function, and they are considered to be temperature dependent. Two types of temperature distribution, namely uniform and nonlinear temperature rises, are considered. Equations of motion based on Euler-Bernoulli beam theoryare derived from Hamilton’s principle and they are solved by a simple finite element formulation in combination with Newmark time-integration procedure. Numerical results show that the dynamic deflection and dynamic amplification factor is decreased with increasing the temperature rise, and the decreasein the uniform temperature rise is more significant that by the nonlinear temperature rise. The excitation frequency plays an important role in the dynamic behavior of the beams, and the frequency at which resonant phenomenon can occur depends on the temperature. A parametric study is carried out to highlight the effect of the temperature rise and moving load parameters on the dynamic behavior of the beams. Dynamic Behavior of Functionally Graded Beams in Thermal Environment due to a Moving Harmonic Load Publication History: Received: July 04, 2016 Accepted: October 03, 2016 Published: October 05, 2016