Abstract: Oscillations of the trajectory of exciton–polaritons propagating in the plane of an optical microcavity with integral quantum wells are studied. This effect is characteristic of systems with the splitting of spin states, and arises as a result of the mutual influence of the spin (polarization) degree of freedom and the translational motion of polaritons. The trajectory’s period of oscillation is determined by the splitting of the photon and exciton components of the polaritons.