^{1}A‘ 2 ^{1}A‘, and 1 ^{1}A‘ ‘, of N_{2}O have been computed as a function of the *R*_{N}_{2}_{–}_{O} bond distance and the Jacobi angle. The calculations are performed using the complete-active-space self-consistent field (CASSCF) and the multireference configuration interaction (MRCI) electronic structure methods. It is shown that there is a wide avoided crossing between the ground, X̃ ^{1}A‘, and lowest excited, 2 ^{1}A‘, electronic state. This avoided crossing is thought to give rise to a seam of conical intersection at other N−N separations. Both excited state surfaces display important conical intersections at linear geometries. The transition dipole moment surfaces for the two excitation processes (2 ^{1}A‘ ← X̃ ^{1}A‘ and 1 ^{1}A‘ ‘ ← X̃ ^{1}A‘) are also presented. These calculations provide the basic data needed to compute the dynamics of the N_{2}O + *h*ν → N_{2} + O(^{1}D) photodissociation process for photon frequencies in the range 5.2 eV (240 nm) to 7.3 eV (170 nm).