Based on a self-collimation ring resonator (SCRR) in a rod-type silicon photonic crystal, a 1×2 optical drop splitter (ODS) with selected splitting ratio is proposed. The 1×2 ODS consists of three beam splitters and one mirror, and light propagates in the ODS employing self-collimation effect. The theoretical transmission spectra at different drop ports of the ODS are analyzed with the multiple-beam interference theory, and they were investigated with the finite-difference time-domain (FDTD) simulation technique. The simulation results agree well with the theoretical prediction. For the drop wavelength 1 550 nm, the free spectral range of the ODS is about 30 nm, which almost covers the whole optical communication C-band window. Because of their small dimensions and whole-silicon material, the proposed ODSs hold great potentials for applications in photonic integrated circuits (PICs).