The spectrum of four-times ionized cerium Ce v has been observed with a sliding-spark discharge and a 10.7-m normal-incidence vacuum spectrograph. A total of 107 lines have been classified as transitions between 51 energy levels. All levels of the 5${\mathit{p}}^{6}$, ${5\mathrm{p}}^{5}$4f, 5${\mathit{p}}^{5}$5d, 5${\mathit{p}}^{5}$6s, 5${\mathit{p}}^{5}$6p, and 5${\mathit{p}}^{5}$6d configurations have been determined. Because of collapse of the 4f shell, the 5${\mathit{p}}^{5}$4f configuration is situated well below 5${\mathit{p}}^{5}$5d. Ab initio calculations and least-squares fits of the energy parameters to the experimental energy levels are reported. The ionization energy is revised to 527 100\ifmmode\pm\else\textpm\fi{}2000 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ (65.35\ifmmode\pm\else\textpm\fi{}0.25 eV).