The spectrum of four times-ionized krypton (Kr v) has been observed in the 240-2500 Â wavelength range. Three of the four possible levels of the 4s²4p5s configuration and two of the three remaining energy level values for the 4s²4p4d configurations were determined. Nine of the ten possible levels for the 4s²4p5p configuration are also reported. The observed configurations were interpreted theoretically by means of Hartree-Fock relativistic calculations and a least squares fit of the energy parameters to the observed levels. 111 new classified lines are reported among the 4s²4p², 4s²4p5p, 4s4p³, 4s²4p5s, and 4s²4p4d configurations.Facultad de Ingeniería