We report on linewidth measurements on the J=24 K,11 −23K ′ ,10 and J=38 K,33 −37K ′ ,32 millimeter wave transitions in the ground vibrational state of nitric acid, located near 470.23 and 544.36GHz, respectively. Experiments were performed with N 2 and O 2 as perturber molecules, in the 240–350K temperature range by using a video-type spectrometer. The foreign-gas broadening parameters and their temperature dependence coefficients were determined using the Voigt profile, no narrowing effect being observed. In order to check the reliability of reported values, we carried out measurements on the J=14 K,12 −13K ′ ,11 transition located near 206.6GHz, previously observed in two other laboratories. For this last line all the reported values are consistent themselves within one claimed standard deviation.