The concept of the sustaining fantasy and the Sustaining Fantasy Questionnaire (SFQ), an instrument for its measurement, is introduced. Sustaining fantasies represent characteristic ways to ameliorate intense negative affect or to restore self-esteem. The responses of 134 psychiatric inpatients were used to construct ten scales. The SFQ and MMPI were then administered to 125 nonpatients. Psychiatric inpatients had higher scores than normals on fantasies of death, withdrawal, restitution, suffering, God, and closeness. Fantasies of power and revenge, admiration of self, competition and aesthetics did not differentiate between groups. SFQ scales correlated significantly with MMPI scales and demographic characteristics as well with staff ratings of the inpatients.