MMPI scores of 57 native and 218 non-native Canadian Prairie psychiatric offenders were compared. In uncontrolled comparisons, considerable cross-cultural profile similarity was observed. Nevertheless, natives displayed significantly higher scores on L, F, and Hs (p < .05), and tended towards significance on Sc (p < .08). Natives scored significantly lower on Mf. Next, separate native and non-native multiple regressions were performed, using the 13 MMPI scales as criterion variables with age, time served, education level, WAIS full scale IQ, and Verbal Comprehension as the predictors. Average /P's of .26 (ns) and .17 (p < .001) were observed for natives and non-natives, respectively. WAIS full scale IQ and education level were the strongest predictors of native and non-native MMPIs, respectively. When controlled MMPI comparisons were made using IQ and education as covariates, the previous differences were erased. Profile similarity was still evident. With covariates, significantly lower native scores were found on Mf, Pa, and Si, while K was significantly higher. The lowered native profile was due primarily to the IQ covariate. It was concluded that the MMPI was valid for use with native offenders where consideration is given to the secondary effects of IQ and the limited influence of culture.The Minnesota Multiphasic Personality Inventory (MMPI) is the most widely used psychological assessment tool in correctional jurisdictions (Gendreau, 1975;Gearing, 1979; National Institute of Corrections, 1985). Concerning the measure's validity, Gearing (1979) reviewed 71 studies of MMPI applications in forensics and concluded that the test provides a reasonable classification of psychopathology among offenders. Frequently, the MMPI is used with other information in selecting an inmate's prison placement, in making a treatment plan, in coming to a parole decision (Elion & Megargee, 1975), and in screening incomingThe views expressed herein are the sole responsibility of the authors and do not necessarily reflect the position of the Solicitor General of Canada or Correctional Service of Canada. The data were collected while the second author was at the Regional Psychiatric Centre (Prairies). Thanks to Tracy Pytlowany, Eric Smith, and Ingrid Draper for assisting with the data collection and to Rod Luciuk for computerizing records. Requests for reprints should be addressed to the second author at Rideau