The solution of the eigenvalue problem of the Laplacian on a general homogeneous space G∕H is given. Here, G is a compact, semisimple Lie group, H is a closed subgroup of G, and the rank of H is equal to the rank of G. It is shown that the multiplicity of the lowest eigenvalue of the Laplacian on G∕H is just the degeneracy of the lowest Landau level for a particle moving on G∕H in the presence of the background gauge field. Moreover, the eigenspace of the lowest eigenvalue of the Laplacian on G∕H is, up to a sign, equal to the G-equivariant index of the Kostant’s Dirac operator on G∕H.