We report radial imbibition of water in a porous medium in a Hele-Shaw cell, including forced imbibition and spontaneous imbibition. Washburn’s law is confirmed in our experiment. Radial imbibition follows scaling dynamics. For forced radial imbibition, anomalous roughening dynamics is found when the front invades the porous medium, and the roughening dynamics depend on the flow rate of the injected fluid. The growth exponents increase linearly with an increase in the flow rate while the roughness exponents decrease with an increase in the flow rate. While for spontaneous imbibition, we found a growth exponent (β=0.6) that was independent of the pressure applied at the liquid inlet, and the roughness exponent decreased with an increase in pressure. Thus, it has become evident that the roughening dynamics of radial imbibition is markedly different from one dimensional imbibition with a planar interface window.