The geometrical parameters, the frequencies, and absolute intensities for transitions between vibrational states of NH3 center dot center dot center dot cis-HONO and NH3 center dot center dot center dot cis-DONO hydrogen-bonded complexes are calculated using the approach earlier tested in calculations of isolated molecules of nitrous acid and the NH3 center dot center dot center dot trans-HONO and NH3.. trans-DONO complexes. Vibrational wave functions and energy values of the complexes are derived from variational solutions of anharmonic equations in rone to four aiMerisions. The equilibrium nuclear configuration and potential energy surfaces are calculated by the MP2/atig-ec-pVTZ method with the basis set superposition error taken into account. Comparison of the obtained results with the analogous data calculated in the same approximation for isolated cis- and trans-HONO (DONO) molecules and the NH3 trans-HONO (DONO) complexes provides information about the changes in the spectroscopic and geometrical parameters of nitrous acid upon cis trans transition, H/D substitution, and H-bond formation.