The ν2 fundamentals of 14ND3 and 15ND3 have been observed with sufficient resolution to resolve many of the individual P, Q, and R lines for both components of the inversion doublet. With the help of the observed intensity alterations assignments of many of the lines were made. A least-squares analysis was applied to determine the various vibration-rotation constants pertinent for these transitions. The 14N15N isotope shift is found to be -6.2 cm-1. © 1979.