[en] The limited viewing access and asymmetric D-shaped plasmas on DIII-D make millimeter-wave reflectometry an attractive diagnostic for density profile and fluctuation measurements. For a reflectometer the Abel inversion of the phase information is performed along the line of sight, so only a single viewing chord, and no symmetry assumption, is required for density profile measurements. The quantity required for the profile determination is a measure of the propagation delay (phase or time) to the cutoff layer and back, either continuously or at several points on the density profile. In its final form the reflectometer system for DIII-D will be composed of two independent reflectometers; a seven channel narrowband reflectometer for density profile and fluctuation measurements, primarily in the plasma edge region, and a broadband reflectometer for full density profile measurements. Laboratory testing of the broadband system is nearly complete, and we are aiming for installation on DIII-D in early 1989. In this paper we will restrict our attention to some of the results which have been obtained with the narrowband reflectometer. 7 refs., 4 figs