The aim of the research work is to presents the result of experimental studies concerning the fatigue behaviour of geopolymer concrete beams. In this study the fly ash based geopolymer mix design was obtained for M40 grade concrete. The fluid to fly ash ratio was fixed as 0.45. The ratio of sodium silicate to sodium hydroxide was 2.5 and the concentration of solution is 14 molar. The preliminary tests were carried out for the geopolymer concrete and optimizing the mix design. A total of four beams of size 125 × 250 × 3200 mm were cast and tested in the laboratory. All the beams were tested under fatigue loading (compression cyclic) with help of hydraulic actuator. Comparison is made between reinforced concrete and geopolymer concrete and results are presented.