A method based upon Taylor dispersion theory is used to determine the shear‐induced diffusion coefficient in concentrated suspensions. The experiments are performed in a cylindrical Couette device with a suspension consisting of polystyrene spheres in a density‐matched solution of glycerin and water. A sequence of several hundred transit times for a single tagged sphere to complete successive orbits within the device is measured. The data are analyzed to compute the azimuthal Taylor dispersion coefficient from which the coefficient of shear‐induced diffusivity is obtained. In our experiments the particle Reynolds numbers areO(10−1). The experimental results are compared to the existing measurements of the shear‐induced diffusion coefficient obtained at lower particle Reynolds numbers and based upon short‐time data. We find a shear‐enhanced diffusion coefficientD⊥/&ggr;˙a2=O(0.1) for a volume fraction of &fgr;≊0.25; this is comparable to existing results from previous low particle Reynolds number studies (R<10−3). ©1996 American Institute of Physics.