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A comprehensive set of dimensionless graphs of complex-valued dynamic interaction factors versus frequency is presented for vertical, horizontal, and rocking harmonic excitation at the head of each pile. These readily applicable graphs have been developed with a rigorous analytical-numerical formulation for two idealized soil profiles (a homogeneous half-space and a half-space with modulus proportional to depth) and three pile separation distances (3,5, and 10 pile-diamctcrs). A wide range of values has been parametrically assigned to pile slendcrncss and pile-to-soil stiffness ratios. The results are discussed at length to gain valuable insight into the nature of dynamic pile-soil-pile interaction. Gcotcchnical and earthquake engineers can use the presented graphs exactly as they use the classical interaction factors for static deformation analysis of pile groups.1. ct" = interaction factor for vertical deflection under vertical loading.