The study investigated the influence of some psychological factors on perceived workers' productivity in private organizations in Nigeria. This is for the purpose of ascertaining the contributions of psychological factors to perceived workers' productivity in work organizations in Nigeria. A descriptive survey research design was adopted for the study. A total of 341 respondents were selected for the study, using stratified sampling technique. The instruments used for data collection are structured questionnaires titled Job Involvement Scale (JIS); Self Efficacy Scale (SES), Job Satisfaction Scale (JSS) and Locus of Control Scale (LCS). The hypotheses generated for the study were tested at 0.05 alpha levels using Regression Analysis statistics. The findings of the study revealed that: The psychological factors were found to have jointly contributed to perceived workers' productivity in private organizations. Relatively, job involvement, self-efficacy, job satisfaction and locus of control have significantly predicted perceived workers` productivity. Based on the findings, it is recommended that workers should be deeply involved in organizational programme of activities in order to create rooms for their participation in the planning and implementation of decision process. This will definitely foster job involvement and job satisfaction among the workers and enhance increased workers' productivity.