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Using mid-infrared laser direct absorption spectroscopy with a quantum cascade laser light source, we investigated the room-temperature pressure broadening of nitrous oxide (N2O) in carbon dioxide (CO2) over the 1273.7–1277.2 cm−1wavenumber range for the ν1symmetric stretching mode. The five measured absorption profiles of N2O were analyzed with Voigt functions. The CO2pressure broadening coefficients ranged from 0.091(3) cm−1atm−1for the P(13) line to 0.125(2) cm−1atm−1for the P(9) line.