We report a comprehensive photo absorption study of nitrous oxide (N₂O) in the vacuum Ultraviolet (45,000–95,000cm^-1) region using synchrotron radiation. The observed Spectrum comprises of a few valence transitions and low lying Rydberg series converging to the two spin–orbit components (²П_1/2,3/2) of the ground state of N₂O⁺. Spectral analysis is aided by extensive quantum chemical calculations of vertical excited states, oscillator strengths and potential energy curves using the time dependent density functional theory. Vibronic b and s observed in the first absorption system (45,000–60,000cm^-1) are Assigned to hot b and progressions in ν^′₂ originating from v″=1 or 2. New insights into the assignment of the well-formed progression of b and s in the X¹Σ⁺→C¹П system (60,000–72,000cm^-1)  are afforded by consideration of the Renner–Teller interaction. A set of molecular vibrational parameters (ω₂=467 cm^-1, x₂₂=2.9,  ε=0.24) for the C¹П state are derived from a fitting of the experimental data. The 3pπ¹Σ⁺ state at ~77,600cm^-1 shows alarge quantum defect (0.96) which is explained as a rising due to mixed valence–Rydbergcharacter. In the 85,000–95,000cm^-1 region,  a number of absorption features are observed with greater clarity than in earlier photo absorption studies and assigned to Rydberg series of type nlλ (n=3,4; l=s,p,d; λ=σ,π,δ) and accompanying vibronic b and s. This work has resulted in clarification of several discrepancies in earlier Rydberg series  assignments. Additionally, the 3pπ ³Σ^- Rydberg state at 85,788cm^-1, the valencetransition 7σ→3π (¹П) at 87, 433cm^-1 and the 3dλ  Rydberg series in the 91,700–92,600cm^-1 region areas signed for the first time.