Jet production rates are measured in p + p and d + Au collisions at √S_NN = 200 GeV recorded in 2008 with the PHENIX detector at the Relativistic Heavy Ion Collider. Jets are reconstructed using the R = 0.3 anti-k_t algorithm from energy deposits in the electromagnetic calorimeter and charged tracks in multiwire proportional chambers, and the jet transverse momentum (pT ) spectra are corrected for the detector response. Spectra are reported for jets with 12 < pT < 50 GeV/c, within a pseudorapidity acceptance of  ιηι < 0.3. The nuclear-modification factor (R_dAu) values for 0%–100% d +  Au events are found to be consistent with unity, constraining the role of initial state effects on jet production. However, the centralityselected R_dAu values and central-to-peripheral ratios (R_CP) show large, pT-dependent deviations from unity, challenging the conventional models that relate hard-process rates and soft-particle production in collisions involving nuclei.