The nuclear quadrupole coupling constants for the two nitrogen atoms in monodeuterated furazan (C 2 HDN 2 O) were determined from the hyperfine structure of eight rotational transitions with low J-values. The coupling constants along the inertial axes are: χ aa (2) = + 3.546(10) MHz, χ aa (5) = -5.044(10) MHz, χ bb (2) = -4.690(10) MHz, χ bb (5) = + 3.900(10) MHz, χ cc (2) = + 1.144(10) MHz, χ cc (5) = + 1.144(10) MHz. In conjunction with structural information from the preceding study, these data yield the principal coupling constants, with 3er-uncertainties, as: χ R (2/5) = - 5.53 (4) MHz, χ T (2/5) = + 4.39(4)MHz, χ R (2/5) = + 1.14(4) MHz. The radial electric field gradients deviate from the direction of the external bisector of the ring angle ONC by 24.6° towards the oxygen atom. These results are in qualitative agreement with previous work by NQR spectroscopy and with the results of ab initio molecular orbital calculations.