A procedure is presented for the calculation of the double vibrational collision-induced absorption CO₂ (ν₃ = 1) + N₂ (ν₁ = 1) ← CO₂ (ν₃ = 0) + N₂ (ν₁ = 0) on the basis of quantum lineshapes computed using an isotropic potential and dipole-induced dipole functions. The linestrengths and energies of the vibration–rotation transitions are treated explicitly for N₂, utilizing the HITRAN database for CO₂. The theoretical absorption profile is compared to recent experimental results. By narrowing the width of the individual lines contributing to the overall absorption profile relative to their values determined for N₂–N₂ collision-induced absorption, excellent agreement between theory and experiment is obtained.