Particles are assumed to have oblate and prolate spheroidal, spherical, disklike, and needlelike shapes, with symmetry axes for oblate and prolate spheroids assumed to be either parallel or perpendicular to the acoustic field. The disk‐shaped and needle‐shaped particles are assumed to be either broadside or edgewise (or end on) to the acoustic field. A wave equation is developed for dilute suspensions of the particles which yields a formula for sound velocity and viscous absorption coefficient. For large differences in densities between suspension components, computations indicate substantial effects of particle shape, orientation, and ultrasound frequency on the velocity of sound through the suspension. A particle moving edgewise or end‐on to the acoustic field causes a greater loss of sound energy than a particle moving broadside to the acoustic field.