By means of spectrographic observations obtained at CTIO, Chile, we have determined that HDE 320102 is an 06 + WN binary system, with an orbital period of 12.595 days. We present an analysis of the orbital elements of this system based on radial velocities of the absorption lines of the O6 component, and of the HeII λ 4686 Á and NV λλ 4603-19 Å emissions of the WN component.